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When i am trying to get excel export, Button_click do nothing ASP.NET C#

When i am trying to get excel export from my mysqldatabase, it doesnt do anything on button_click. I can see that gridview is filling by DataTable but on postback it doesnt download the excel output of my gridview.I cant find out that where is the problem. Thanks for helping guys.
Here is my .aspx gridview code
<asp:GridView ID="GridView1" HeaderStyle-BackColor="#3AC0F2" HeaderStyle-ForeColor="White"
RowStyle-BackColor="#A1DCF2" AlternatingRowStyle-BackColor="White" AlternatingRowStyle-ForeColor="#000"
runat="server" AutoGenerateColumns="false" AllowPaging="true" OnPageIndexChanging="OnPageIndexChanging">
<Columns>
<asp:BoundField DataField="isbn" HeaderText="isbn" ItemStyle-Width="150px" />
<asp:BoundField DataField="display_name" HeaderText="bookName" ItemStyle-Width="100px" />
<asp:BoundField DataField="authorName" HeaderText="authorName" ItemStyle-Width="100px" />
</Columns>
Here is my databind and button click
private void BindGrid()
{
DataTable dt = book.getAllbookExcelExport();
GridView1.DataSource = dt;
GridView1.DataBind();
}
protected void btnExport_ServerClick(object sender, EventArgs e)
{
Response.Clear();
Response.Buffer = true;
Response.AddHeader("content-disposition", "attachment;filename=GridViewExport.xls");
Response.Charset = "";
Response.ContentType = "application/vnd.ms-excel";
using (StringWriter sw = new StringWriter())
{
HtmlTextWriter hw = new HtmlTextWriter(sw);
//To Export all pages
GridView1.AllowPaging = false;
this.BindGrid();
GridView1.HeaderRow.BackColor = Color.White;
foreach (TableCell cell in GridView1.HeaderRow.Cells)
{
cell.BackColor = GridView1.HeaderStyle.BackColor;
}
foreach (GridViewRow row in GridView1.Rows)
{
row.BackColor = Color.White;
foreach (TableCell cell in row.Cells)
{
if (row.RowIndex % 2 == 0)
{
cell.BackColor = GridView1.AlternatingRowStyle.BackColor;
}
else
{
cell.BackColor = GridView1.RowStyle.BackColor;
}
cell.CssClass = "textmode";
}
}
GridView1.RenderControl(hw);
//style to format numbers to string
string style = #"<style> .textmode { } </style>";
Response.Write(style);
Response.Output.Write(sw.ToString());
Response.Flush();
Response.End();
}
}
Here is my page_load
protected void Page_Load(object sender, EventArgs e)
{
Page.Form.Attributes.Add("enctype", "multipart/form-data");
ScriptManager scriptManager = ScriptManager.GetCurrent(this.Page);
scriptManager.RegisterPostBackControl(btnSave);
if (!Page.IsPostBack)
{
this.BindGrid();
}
}

export Gridview to Excel using ClosedXML without warning: the file you are trying to open is in a different format

I am working on a ASP.NET 4.5 Webform and I have a Gridview (that has custom TemplateField and gets data from a sqlDataSource)
I have this event to export the gridview contents to an excel sheet, and it does its jobs well except the created file is giving out an warning when user open it (which I understand because the file that got created is not an actual excel file):
"the file you are trying to open is in a different format than
specified by the file extension"
protected void btnExport_Excel_Click(object sender, EventArgs e)
{
try
{
Response.Clear();
Response.Buffer = true;
Response.AddHeader("content-disposition", "attachment;filename=GV.xls");
Response.Charset = "";
Response.ContentType = "application/ms-excel";
//Response.ContentType = "application/text";
Response.ContentEncoding = System.Text.Encoding.Unicode;
Response.BinaryWrite(System.Text.Encoding.Unicode.GetPreamble());
using (StringWriter sw = new StringWriter())
{
HtmlTextWriter hw = new HtmlTextWriter(sw);
//To Export all pages
GridView4.AllowPaging = false;
GridView4.AllowSorting = false;
GridView4.ShowFooter = false;
GridView4.DataBind();
//this.BindGrid();
GridView4.HeaderRow.BackColor = Color.White;
foreach (TableCell cell in GridView4.HeaderRow.Cells)
{
cell.BackColor = GridView4.HeaderStyle.BackColor;
}
foreach (GridViewRow row in GridView4.Rows)
{
row.BackColor = Color.White;
foreach (TableCell cell in row.Cells)
{
if (row.RowIndex % 2 == 0)
{
cell.BackColor = GridView4.AlternatingRowStyle.BackColor;
}
else
{
cell.BackColor = GridView4.RowStyle.BackColor;
}
cell.CssClass = "textmode";
}
}
GridView4.RenderControl(hw);
//style to format numbers to string
string style = #"<style> .textmode { } </style>";
Response.Write(style);
Response.Output.Write(sw.ToString());
Response.Flush();
Response.End();
}
//Display message
InfoPanel.Visible = true;
InfoPanel.CssClass = "panel panel-success";
lblMessage.CssClass = "text text-sucess bold";
lblMessage.Text = "File has been exported!";
}
catch (Exception ex)
{
//Display message
InfoPanel.Visible = true;
lblMessage.Text = "<b>An error has occurred. Please try again later!</b></br>" + ex.Message;
lblMessage.CssClass = "text text-danger bold";
InfoPanel.CssClass = "panel panel-danger";
panelResult.Visible = false;
}
}
the result in the Excel .xls file is good (no styles except header columns, no footer, just exact as shown on the Gridview):
I am finding another way to avoid this warning, so I see people like to use
ClosedXML, so I replace that event above with this event:
protected void ExportExcel(object sender, EventArgs e)
{
DataTable dt = new DataTable("GridView_Data");
foreach(TableCell cell in GridView4.HeaderRow.Cells)
{
dt.Columns.Add(cell.Text);
}
foreach (GridViewRow row in GridView4.Rows)
{
dt.Rows.Add();
for (int i=0; i<row.Cells.Count; i++)
{
dt.Rows[dt.Rows.Count - 1][i] = row.Cells[i].Text;
}
}
using (XLWorkbook wb = new XLWorkbook())
{
wb.Worksheets.Add(dt);
Response.Clear();
Response.Buffer = true;
Response.Charset = "";
Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
Response.AddHeader("content-disposition", "attachment;filename=GV.xlsx");
using (MemoryStream MyMemoryStream = new MemoryStream())
{
wb.SaveAs(MyMemoryStream);
MyMemoryStream.WriteTo(Response.OutputStream);
Response.Flush();
Response.End();
}
}
}
and the result is bad (only good new is that the exported file is a real 2007+ Excel sheet so no warnings):
How do I get the "good" result above using closedXML?

The main problem in you second part of code (with ClosedXML) , that you are trying to use Text property of GridViewRow for TemplateField field columns. As you can see here, you can get field value via Text property only for BoundField field columns and automatically generated field columns.
To get value from TemplateField you should navigate to inner control which contains value and get value from it.
If you have the following column template:
<asp:TemplateField>
<ItemTemplate>
<asp:Label ID="labelName" runat="server" Text ='<%# Eval("ABC")%>' ></asp:Label>
</ItemTemplate>
</asp:TemplateField>
Your code should be:
for (int i=0; i<row.Cells.Count; i++)
{
dt.Rows[dt.Rows.Count - 1][i] = (row.Cells[i].FindControl("labelName") as Label).Text;
}
EDIT
Your code should be as follows:
protected void ExportExcel(object sender, EventArgs e)
{
DataTable dt = new DataTable("GridView_Data");
foreach (DataControlField col in GridView4.Columns)
{
dt.Columns.Add(col.HeaderText);
}
foreach (GridViewRow row in GridView4.Rows)
{
dt.Rows.Add();
for (int i = 0; i < row.Cells.Count; i++)
{
dt.Rows[dt.Rows.Count - 1][i] = (FindControl(row.Cells[i].Controls, "lbl") as Label).Text;
}
}
//your code below is not changed
}
protected Control FindControl(ControlCollection collection, string id)
{
foreach (Control ctrl in collection)
{
if (ctrl.ID == id)
return ctrl;
}
return null;
}
Ensure that all Label controls used in TemplateField have the same ID as "lbl":
<asp:TemplateField HeaderText="ID">
<ItemTemplate>
<asp:Label ID="lbl" runat="server" Text ='<%# Eval("ID")%>' ></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Name">
<ItemTemplate>
<asp:Label ID="lbl" runat="server" Text ='<%# Eval("Name")%>' ></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Amount">
<ItemTemplate>
<asp:Label ID="lbl" runat="server" Text ='<%# Eval("Amount")%>' ></asp:Label>
</ItemTemplate>
</asp:TemplateField>

I tried it's working ,please find the code hope it will help you:
Index.aspx
<%# Page Language="C#" AutoEventWireup="true" CodeBehind="Index.aspx.cs" Inherits="ExportExcel.Index" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:GridView ID="GridView1" HeaderStyle-BackColor="#3AC0F2" HeaderStyle- ForeColor="White"
runat="server" AutoGenerateColumns="false">
<Columns>
<asp:BoundField DataField="Id" HeaderText="Id" ItemStyle-Width="30" />
<asp:TemplateField HeaderText="Name">
<ItemTemplate>
<asp:TextBox ID="txtName" runat="server" Text='<%#Eval("Name") %>'></asp:TextBox>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Country">
<ItemTemplate>
<asp:Label ID="lblCountry" Text='<%# Eval("Country") %>' runat="server" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
<br />
<asp:Button ID="btnExport" Text="Export" runat="server" OnClick="btnExport_Click" />
</div>
</form>
Index.aspx.cs
using ClosedXML.Excel;
using System;
using System.Collections.Generic;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace ExportExcel
{
public partial class Index : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!this.IsPostBack)
{
GetData();
}
}
private void GetData()
{
DataTable dt = new DataTable();
dt.Columns.AddRange(new DataColumn[3] { new DataColumn("Id", typeof(int)), new DataColumn("Name", typeof(string)), new DataColumn("Country", typeof(string)) });
dt.Rows.Add(1, "abc", "UK");
dt.Rows.Add(2, "def", "India");
dt.Rows.Add(3, "ghi", "France");
dt.Rows.Add(4, "jkl", "Russia");
GridView1.DataSource = dt;
GridView1.DataBind();
}
protected void btnExport_Click(object sender, EventArgs e)
{
try
{
DataTable dt = new DataTable("GridView_Data");
foreach (TableCell cell in GridView1.HeaderRow.Cells)
{
dt.Columns.Add(cell.Text);
}
foreach (GridViewRow row in GridView1.Rows)
{
TextBox txtNameRow = (TextBox)row.FindControl("txtName");
Label lblCountryRow = (Label)row.FindControl("lblCountry");
DataRow drow = dt.NewRow();
for (int i = 0; i < GridView1.Columns.Count; i++)
{
drow[i] = row.Cells[i].Text;
}
drow["Name"] = txtNameRow.Text;
drow["Country"] = lblCountryRow.Text;
dt.Rows.Add(drow);
}
using (XLWorkbook wb = new XLWorkbook())
{
wb.Worksheets.Add(dt);
Response.Clear();
Response.Buffer = true;
Response.Charset = "";
Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
Response.AddHeader("content-disposition", "attachment;filename=GV.xlsx");
using (MemoryStream MyMemoryStream = new MemoryStream())
{
wb.SaveAs(MyMemoryStream);
MyMemoryStream.WriteTo(Response.OutputStream);
Response.Flush();
Response.End();
}
}
}
catch (Exception ex)
{
throw;
}
}
}
}

I call the Export to Excel on a button click event like the following
protected void btnPrint_Click(object sender, EventArgs e)
{
fileName = string.Format(fileName, DateTime.Now.ToString("MMddyyyy_hhmmss"));
Extensions.ExportToXcel_SomeReport(dt, fileName, this.Page);
}
from there I have a utils class called Extensions where I have the ExportToExcel_SomeReport method defined
public static class Extensions
{
internal static void ExportToXcel_SomeReport(DataTable dt, string fileName, Page page)
{
var recCount = dt.Rows.Count;
RemoveHtmlSpecialChars(dt);
fileName = string.Format(fileName, DateTime.Now.ToString("MMddyyyy_hhmmss"));
var xlsx = new XLWorkbook();
var ws = xlsx.Worksheets.Add("Some Report Name");
ws.Style.Font.Bold = true;
ws.Cell("C5").Value = "YOUR REPORT NAME";
ws.Cell("C5").Style.Font.FontColor = XLColor.Black;
ws.Cell("C5").Style.Font.SetFontSize(16.0);
ws.Cell("E5").Value = DateTime.Now.ToString("MM/dd/yyyy HH:mm");
ws.Range("C5:E5").Style.Font.SetFontSize(16.0);
ws.Cell("A7").Value = string.Format("{0} Records", recCount);
ws.Style.Font.Bold = false;
ws.Cell(9, 1).InsertTable(dt.AsEnumerable());
ws.Row(9).InsertRowsBelow(1);
// ws.Style.Font.FontColor = XLColor.Gray;
ws.Columns("1-9").AdjustToContents();
ws.Tables.Table(0).ShowAutoFilter = true;
ws.Style.Alignment.Horizontal = XLAlignmentHorizontalValues.Center;
DynaGenExcelFile(fileName, page, xlsx);
}
/// <summary>
/// Remove all HTML special characters from datatable field if they are present
/// </summary>
/// <param name="dt"></param>
private static void RemoveHtmlSpecialChars(DataTable dt)
{
for (int rows = 0; rows < dt.Rows.Count; rows++)
{
for (int column = 0; column < dt.Columns.Count; column++)
{
dt.Rows[rows][column] = dt.Rows[rows][column].ToString().Replace(" ", string.Empty);
}
}
}
/// <summary>
/// Call this Method to Generate the Excel Files from different Lap Reports depending on which one has been selected
/// </summary>
/// <param name="fileName"></param>
/// <param name="page"></param>
/// <param name="xlsx"></param>
private static void DynaGenExcelFile(string fileName, Page page, XLWorkbook xlsx)
{
page.Response.ClearContent();
page.Response.ClearHeaders();
page.Response.ContentType = "application/vnd.ms-excel";
page.Response.AppendHeader("Content-Disposition", string.Format("attachment;filename={0}.xlsx", fileName));
using (MemoryStream memoryStream = new MemoryStream())
{
xlsx.SaveAs(memoryStream);
memoryStream.WriteTo(page.Response.OutputStream);
}
page.Response.Flush();
page.Response.End();
}
}

Contrary to popular belief, you can set the extension of your file to be .html, and Excel can open it up.
Just set the extension to HTML:
Response.AddHeader("content-disposition", "attachment;filename=GV.html");
And retain Excel as the content type:
Response.ContentType = "application/ms-excel";
EDIT: Oh, right, forgot to mention, this should make that annoying dialog go away.
EDIT 2: Looks like the original question has changed... now it's talking about using ClosedXML... but I'll leave this answer here just in case someone else is using HTML and Excel.

Gridview dataBound add hyperlink to column data from code behind

Using grid view binding it from code behind:
I want to bind a particular column data into a hyper link so when it clicked it should do a download.
How to do that ?
Below is my code :
for (int i = 0; i <= tbl.Columns.Count - 1; i++)
{
Telerik.Web.UI.GridBoundColumn boundfield = new Telerik.Web.UI.GridBoundColumn();
if (tbl.Columns[i].ColumnName.ToString() == "Row")
{
LinkButton lkbtn = new LinkButton();
lkbtn.CommandName = i;
lkbtn.CommandArgument = "dwnld";
lkbtn.Font.Underline = true;
lkbtn.Text = tbl.Columns(i).ColumnName.ToString();
boundfield.DataField = tbl.Columns(i).ColumnName.ToString()
boundfield.HeaderText = tbl.Columns(i).ColumnName.ToString();
GridView2.MasterTableView.Columns.Add(boundfield);
}
}

Why not use grid template column with link button.
<telerik:GridTemplateColumn>
<ItemTemplate>
<asp:LinkButton ID="btnDownload" OnClick="btnDownload_Click" runat="server">Download Something</asp:LinkButton>
</ItemTemplate>
</telerik:GridTemplateColumn>
protected void btnDownload_Click(object sender, EventArgs e)
{
LinkButton lbBtn = sender as LinkButton;
GridDataItem item = (GridDataItem)(sender as LinkButton).NamingContainer;
// Use item to get other details
...
...
}

How to fire click event of the LinkButton in gridview and Show PopUp window in asp.net

I have tried to build one gridview with dynamic columns based the data source using the template fields in asp.net through code behind.
For that, to implement we have developed one class DynamicTemplate which implements the ITemplate interface. In that template fields i have inserted the LinkButton in each cell and when i click that cell link button i need to show the one Popup with selected cell value.
For Detailed Sample Please download from this link
For that I have created one Default.asxp page and wrote the following.
public partial class Default : System.Web.UI.Page
{
DataTable dt;
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
GenateGridView();
}
private void GenateGridView()
{
TemplateField tempField;
DynamicTemplate dynTempItem;
LinkButton lnkButton;
Label label;
GridView gvDynamicArticle = new GridView();
gvDynamicArticle.Width = Unit.Pixel(500);
gvDynamicArticle.BorderWidth = Unit.Pixel(0);
gvDynamicArticle.Caption = "<div>Default Grid</div>";
gvDynamicArticle.AutoGenerateColumns = false;
DataTable data = getBindingData();
for (int i = 0; i < data.Columns.Count; i++)
{
tempField = new TemplateField();
dynTempItem = new DynamicTemplate(ListItemType.AlternatingItem);
lnkButton = new LinkButton();
lnkButton.ID = string.Format("lnkButton{0}", i);
lnkButton.Visible = true;
string ColumnValue = data.Columns[i].ColumnName;
tempField.HeaderText = ColumnValue;
if (ColumnValue == "EmpName")
{
label = new Label();
label.ID = string.Format("Label{0}", i);
dynTempItem.AddControl(label, "Text", ColumnValue);
label.Width = 100;
}
else
{
dynTempItem.AddControl(lnkButton, "Text", ColumnValue);
lnkButton.Click += lnkButton_Click;
}
tempField.ItemTemplate = dynTempItem;
gvDynamicArticle.Columns.Add(tempField);
//////grdUserPivotDateTwo.Columns.Add(tempField);
}
gvDynamicArticle.DataSource = data;
gvDynamicArticle.DataBind();
divContainer.Controls.Add(gvDynamicArticle);
}
void lnkButton_Click(object sender, EventArgs e)
{
// showing cell values in popUp here..
ClientScript.RegisterStartupScript(this.GetType(), "alert", "alert('cell clicked')");
}
private DataTable getBindingData()
{
dt = new DataTable();
dt.Columns.Add(new DataColumn("EmpName"));
dt.Columns.Add(new DataColumn("Monday"));
dt.Columns.Add(new DataColumn("TuesDay"));
dt.Columns.Add(new DataColumn("WednesDay"));
dt.Columns.Add(new DataColumn("ThursDay"));
dt.Rows.Add("EmpOne", "p", "p", "p", "a");
dt.Rows.Add("EmpTwo", "p", "a", "p", "p");
dt.Rows.Add("EmpThree", "p", "p", "p", "a");
dt.Rows.Add("EmpFour", "p", "a", "p", "p");
dt.Rows.Add("EmpFive", "p", "p", "p", "a");
dt.Rows.Add("EmpSix", "a", "p", "p", "p");
return dt;
}
}
and corresponding DynamicTemplate class is
public class DynamicTemplate : System.Web.UI.ITemplate
{
System.Web.UI.WebControls.ListItemType templateType;
System.Collections.Hashtable htControls = new System.Collections.Hashtable();
System.Collections.Hashtable htBindPropertiesNames = new System.Collections.Hashtable();
System.Collections.Hashtable htBindExpression = new System.Collections.Hashtable();
public DynamicTemplate(System.Web.UI.WebControls.ListItemType type)
{
templateType = type;
}
public void AddControl(WebControl wbControl, String BindPropertyName, String BindExpression)
{
htControls.Add(htControls.Count, wbControl);
htBindPropertiesNames.Add(htBindPropertiesNames.Count, BindPropertyName);
htBindExpression.Add(htBindExpression.Count, BindExpression);
}
public void InstantiateIn(System.Web.UI.Control container)
{
PlaceHolder ph = new PlaceHolder();
for (int i = 0; i < htControls.Count; i++)
{
//clone control
Control cntrl = CloneControl((Control)htControls[i]);
switch (templateType)
{
case ListItemType.Header:
break;
case ListItemType.Item:
ph.Controls.Add(cntrl);
break;
case ListItemType.AlternatingItem:
ph.Controls.Add(cntrl);
ph.DataBinding += new EventHandler(Item_DataBinding);
break;
case ListItemType.Footer:
break;
}
}
ph.DataBinding += new EventHandler(Item_DataBinding);
container.Controls.Add(ph);
}
public void Item_DataBinding(object sender, System.EventArgs e)
{
PlaceHolder ph = (PlaceHolder)sender;
GridViewRow ri = (GridViewRow)ph.NamingContainer;
for (int i = 0; i < htControls.Count; i++)
{
if (htBindPropertiesNames[i].ToString().Length > 0)
{
Control tmpCtrl = (Control)htControls[i];
String item1Value = (String)DataBinder.Eval(ri.DataItem, htBindExpression[i].ToString());
Control ctrl = ph.FindControl(tmpCtrl.ID);
Type t = ctrl.GetType();
System.Reflection.PropertyInfo pi = t.GetProperty(htBindPropertiesNames[i].ToString());
pi.SetValue(ctrl, item1Value.ToString(), null);
}
}
}
private Control CloneControl(System.Web.UI.Control src_ctl)
{
Type t = src_ctl.GetType();
Object obj = Activator.CreateInstance(t);
Control dst_ctl = (Control)obj;
PropertyDescriptorCollection src_pdc = TypeDescriptor.GetProperties(src_ctl);
PropertyDescriptorCollection dst_pdc = TypeDescriptor.GetProperties(dst_ctl);
for (int i = 0; i < src_pdc.Count; i++)
{
if (src_pdc[i].Attributes.Contains(DesignerSerializationVisibilityAttribute.Content))
{
object collection_val = src_pdc[i].GetValue(src_ctl);
if ((collection_val is IList) == true)
{
foreach (object child in (IList)collection_val)
{
Control new_child = CloneControl(child as Control);
object dst_collection_val = dst_pdc[i].GetValue(dst_ctl);
((IList)dst_collection_val).Add(new_child);
}
}
}
else
{
dst_pdc[src_pdc[i].Name].SetValue(dst_ctl, src_pdc[i].GetValue(src_ctl));
}
}
return dst_ctl;
}
}
Here the Data showing in gridview is fine. Here the Issues are when i click on the linkButton the page reloads and no grid is displaying after the postback.
second issue is, for LinkButton the Click Event is not firing.
Please provide me the help full information/Sample to show the modal window when we click on the linkButton of the gridview.

You need to use ajax model popup expender.
Design a panel with your fields and use the model popup expender to display that popup
This link has the sample of it
www.asp.net/ajaxlibrary/ajaxcontroltoolkitsamplesite/modalpopup/modalpopup.aspx
and in your link button click
you have to use show method to open popup

protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
GenateGridView();
}
this code is generating a gridview only if it is not a postback, but when you click a linkbutton a postpack occurs and that's the reason why gridview doesnt show again when you click on the linkbutton.
add the following code(additional else part included to your if code) to show gridview when you click lnkButton
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
GenateGridView();
else
{
string ctrlName = Request.Params.Get("__EVENTTARGET").Trim();
if (!String.IsNullOrEmpty(ctrlName))
{
if (ctrlName.StartsWith("lnkButton"))
{
GenateGridView();
}
}
}
}

It will be a good choice to use CommandName property for the linkbutton on the Gridview and give it a specfic name and in the code file and exactly work with it in RowCommand event of your GridView as following in this example :
first here is the .aspx file :
<div>
<asp:GridView ID="GridViewStudents" runat="server" AutoGenerateColumns="False" OnRowCommand="GridViewStudents_RowCommand">
<Columns>
<asp:TemplateField HeaderText="Stud_ID" Visible="False">
<ItemTemplate>
<asp:Label ID="LabelStudID" runat="server" Text='<%# Eval("Stud_ID") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="FKFather_ID" Visible="False">
<ItemTemplate>
<asp:Label ID="LabelFkFatherID" runat="server" Text='<%# Eval("Fk_Father_ID") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Student Name">
<ItemTemplate>
<asp:Label ID="LabelStudName" runat="server" Text='<%# Eval("Stud_Name") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Class Name">
<ItemTemplate>
<asp:Label ID="LabelRowlevelName" runat="server" Text='<%# Eval("Stud_Level_Row_Name") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Delete">
<ItemTemplate>
<asp:ImageButton ID="ImageButtonDelete" runat="server" CommandArgument='<%# Eval("Stud_ID") %>' CommandName="Remove" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
</div>
<div style="direction: ltr">
<asp:Panel ID="Panel1" runat="server" Visible="false">
<asp:Label ID="Labelpopupmessage" runat="server" Text=""></asp:Label>
<br />
<asp:Button ID="Buttonaccept" runat="server" Text="نعم" OnClick="Buttonaccept_Click" />
<asp:Button ID="Buttoncancel" runat="server" Text="لا" OnClick="Buttoncancel_Click" />
</asp:Panel>
<asp:HiddenField ID="HiddenField1" runat="server" />
<asp:ModalPopupExtender runat="server" ID="ModalPopupExtenderStudent" PopupControlID="ButtonSubmit" TargetControlID="HiddenField1" CancelControlID="Buttoncancel">
</asp:ModalPopupExtender>
</div>
and here is the code implementation of my illustration :
protected void GridViewStudents_RowCommand(object sender, GridViewCommandEventArgs e)
{
if (e.CommandName == "Remove")
{
// I stored the ID of the selected Student I want to delete in a viewstate.
ViewState.Add("DeletedStudDetailID",Convert.ToInt32(e.CommandArgument));
ModalpopupExtender.Show();
}
}
// Here in the accept delete button I used that code ..
protected void Buttonaccept_Click(object sender, EventArgs e)
{
try
{
if (ViewState["DeletedStudDetailID"] != null)
{
StudentDetail StudDet = Data.StudentDetails.Single(SD => SD.Fk_Stud_ID == Convert.ToInt32(ViewState["DeletedStudDetailID"]));
Data.StudentDetails.DeleteOnSubmit(StudDet);
Student Stud = Data.Students.Single(S => S.Stud_ID == Convert.ToInt32(ViewState["DeletedStudDetailID"]));
Data.Students.DeleteOnSubmit(Stud);
Data.SubmitChanges();
}
this.ResultMessage = "Delete Done Sucessfully !!";
}
catch
{
this.ErrorMessage = "Delete operation disordered !!";
}
finally
{
ModalPopExtender.Hide();
}
}
I hope it helps in your issue and I wish you a happy day :) !!

First, your GridView will be created when calling GenateGridView method, so you have to call this method everytime you do post back, then your Page_Load should be
protected void Page_Load(object sender, EventArgs e)
{
GenateGridView();
}
Second, I would present you the other way to add LinkButton to GridView dynamically.
I modified your GenateGridView to just add only label into DynamicTemplate, also add this line gvDynamicArticle.RowDataBound += new GridViewRowEventHandler(gvDynamicArticle_RowDataBound); to handle adding LinkButton.
private void GenateGridView()
{
TemplateField tempField;
DynamicTemplate dynTempItem;
Label label;
GridView gvDynamicArticle = new GridView();
gvDynamicArticle.Width = Unit.Pixel(500);
gvDynamicArticle.BorderWidth = Unit.Pixel(0);
gvDynamicArticle.Caption = "<div>Default Grid</div>";
gvDynamicArticle.AutoGenerateColumns = false;
gvDynamicArticle.RowDataBound += new GridViewRowEventHandler(gvDynamicArticle_RowDataBound);
DataTable data = getBindingData();
for (int i = 0; i < data.Columns.Count; i++)
{
tempField = new TemplateField();
dynTempItem = new DynamicTemplate(ListItemType.AlternatingItem);
string ColumnValue = data.Columns[i].ColumnName;
tempField.HeaderText = ColumnValue;
label = new Label();
label.ID = string.Format("Label{0}", i);
dynTempItem.AddControl(label, "Text", ColumnValue);
label.Width = 100;
tempField.ItemTemplate = dynTempItem;
gvDynamicArticle.Columns.Add(tempField);
}
gvDynamicArticle.DataSource = data;
gvDynamicArticle.DataBind();
divContainer.Controls.Add(gvDynamicArticle);
}
I implement like this in RowDataBound event handler of the GridView to add LinkButton and hide the Label which we added it before:
protected void gvDynamicArticle_RowDataBound(object sender, GridViewRowEventArgs e)
{
for (int j = 1; j < e.Row.Cells.Count; j++)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
LinkButton lnkButton = new LinkButton();
lnkButton.ID = string.Format("lnkButton{0}{1}", e.Row.DataItemIndex, j);
lnkButton.Click += new EventHandler(lnkButton_Click);
Label tempLabel = e.Row.FindControl("Label" + j) as Label;
lnkButton.Text = tempLabel.Text;
lnkButton.CommandArgument = tempLabel.Text;
tempLabel.Visible = false;
e.Row.Cells[j].Controls.Add(lnkButton);
}
}
}
You can also set any value to CommandArgument of LinkButton, then you can show it in the alert.
Final, seems you want to show some value in the alert, you may code like this
public void lnkButton_Click(object sender, EventArgs e)
{
// showing cell values in popUp here..
LinkButton lnk = (LinkButton)sender;
ClientScript.RegisterStartupScript(this.GetType(), "alert", "alert('cell clicked, value " + lnk.CommandArgument + "')", true);
}

Remove Checkboxes while exporting Gridview to Excel

I have a gridview that needs to be exported to Excel. I have managed to remove the Checkboxes from Rows but don't know how to remove from the Header and also delete the Checkbox Column entirely. Thanks for help.
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" CellPadding="4" DataKeyNames="Id">
<Columns>
<asp:TemplateField HeaderText="Select" >
<HeaderTemplate>
<input id="chkAll" onclick="checkAll(this);" runat="server" type="checkbox" />
</HeaderTemplate>
<ItemTemplate>
<asp:CheckBox ID="CheckBox1" runat="server" />
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="Event" HeaderText="Event" SortExpression="Event" />
<asp:BoundField DataField="Event_Description" HeaderText="Event_Description" SortExpression="Event_Description" />
<asp:BoundField DataField="Start_Date" HeaderText="Start_Date" SortExpression="Start_Date" />
</Columns>
</asp:GridView>
Here's the backend C# code to export to excel.
protected void download_Click(object sender, EventArgs e)
{
PrepareGridViewForExport(GridView1);
Response.ClearContent();
Response.AddHeader("content-disposition", "attachment; filename=GridViewToExcel.xls");
Response.ContentType = "application/excel";
StringWriter sWriter = new StringWriter();
HtmlTextWriter hTextWriter = new HtmlTextWriter(sWriter);
GridView1.RenderControl(hTextWriter);
Response.Write(sWriter.ToString());
Response.End();
}
public override void VerifyRenderingInServerForm(Control control)
{
}
private void PrepareGridViewForExport(Control gv)
{
Literal l = new Literal();
string name = String.Empty;
for (int i = 0; i < gv.Controls.Count; i++)
{
if (gv.Controls[i].GetType() == typeof(CheckBox))
{
gv.Controls.Remove(gv.Controls[i]);
gv.Controls.AddAt(i, l);
}
if (gv.Controls[i].HasControls())
{
PrepareGridViewForExport(gv.Controls[i]);
}
}
}

Try out this export function , which hides not needed column i.e column 0 of the row...
protected void btnExportExcel_Click(object sender, EventArgs e)
{
Response.Clear();
Response.Buffer = true;
Response.AddHeader("content-disposition", "attachment;filename=GridViewExport.xls");
Response.Charset = "";
Response.ContentType = "application/vnd.ms-excel";
StringWriter sw = new StringWriter();
HtmlTextWriter hw = new HtmlTextWriter(sw);
GridView1.DataBind();
GridView1.HeaderRow.Cells[0].Visible = false;
for (int i = 0; i < GridView1.Rows.Count;i++ )
{
GridViewRow row = GridView1.Rows[i];
row.Cells[0].Visible = false;
row.Cells[0].FindControl("chkCol0").Visible = false;
}
GridView1.RenderControl(hw);
Response.Write(style);
Response.Output.Write(sw.ToString());
Response.End();
}
or
On your export, drop the column. Something something like:
GridView1.Columns[0].visible = false;
GridView1.DataBind();
GridView1.RenderControl(htmlWrite);
Response.Write("<meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\" />");

Instead of hiding the control we can remove them before exporting into Excel.This can be done by looping through the cell and find the controls present in the cell. Then identify the control type and remove them from that cell.
Following is the code:
foreach (GridViewRow row in GridView1.Rows)
{
row.BackColor = Color.White;
foreach (TableCell cell in row.Cells)
{
cell.CssClass = "textmode";
for (int i = 0; i < cell.Controls.Count; i++)
{
Control ctr = cell.Controls[i];
if (ctr is TextBox)
cell.Controls.Remove(ctr);
else if (ctr is DropDownList)
cell.Controls.Remove(ctr);
else if (ctr is Label)
{
if (ctr.ClientID.Contains("lblrow"))
cell.Controls.Remove(ctr);
}
}
}
}
In the above code I am looping through the each row and cells. Then removing all the TextBox, DropdownList and Label with the ID lblrow which are present there.