We Keep Coding

event handling is not working in my asp.net web forms web application

The update button Onclick event is not working.
I inserted one more button called button1 for testing if it works, but found that it is not working, even Icacked in other web forms in the app
It is not working at all.
Only page load event-driven is working.
Update:
The problem is not solved with other controls. For example, after the user clicks on an update button, a fucntion will be called that checks the value in the textbox and make some calculation.
After debugging, I found that the program cannot read any values from the textbox.
Note: I am using packages like bootstrap, Ajax as they are already built-in in the asp.net web forms web applications. I have also tried to exclude them from the project as mentioned in some references, however, nothing changed.
Here is my code for Shopping Cart web form:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using Celebreno.Models;
using Celebreno.Cart;
//to use IOrderedDictionary
using System.Collections.Specialized;
using System.Collections;
using System.Web.ModelBinding;
namespace Celebreno
{
public partial class ShowCart : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
//2- Display the total of cart by calling GetTotal() function(located in Actions_of_Cart class)
//and then store the return value in a new variable, then dispaly it in a label
using (Actions_of_Cart usersShoppingCart = new Actions_of_Cart())
{
//declare a new variable to store the total into it
decimal cartTotal = 0;
cartTotal = usersShoppingCart.GetTotal();
if (cartTotal > 0)
{
//Display Total in a label that has property " Enable ViewState = False"
// ViewSate used
LblTotal.Text = String.Format("{0:c}", cartTotal);
}
else
{
LblTotalText.Text = "";
LblTotal.Text = "";
//HtmlGenericControl
ShoppingCartTitle.InnerText = "The Shopping Cart is Empty";
//not yet needed
UpdateBtn.Visible = false;
// CheckoutImageBtn.Visible = false;
}
Button1.Click += Button1_Click;
}
}
//1- decalre the "select Method" (used in GridView in Source Code) to return the value of..
//..calling GetCartItems(), which is defined in Actions_of_Cart DB class
public List<ItemsInCart> GetShoppingCartItems()
{
Actions_of_Cart actions = new Actions_of_Cart();
return actions.GetCartItems();
}
//
public List<ItemsInCart> UpdateCartItems()
{
using (Actions_of_Cart usersShoppingCart = new Actions_of_Cart())
{
//new var
String cartId = usersShoppingCart.GetCartId();
//The UpdateCartItems method gets the updated values for each item in the shopping cart.
//Then, the UpdateCartItems method calls the UpdateShoppingCartDatabase method
//to either add or remove items from the shopping cart.
//Once the database has been updated to reflect the updates to the shopping cart,
//the GridView control is updated on the shopping cart page by calling the DataBind method
//for the GridView. Also, the total order amount on the shopping cart page is updated
//to reflect the updated list of items.
Actions_of_Cart.ShoppingCartUpdates[] cartUpdates = new Actions_of_Cart.ShoppingCartUpdates[CartList.Rows.Count];
for (int i = 0; i < CartList.Rows.Count; i++)
{
IOrderedDictionary rowValues = new OrderedDictionary();
rowValues = GetValues(CartList.Rows[i]);
//ProductId related to struct in Actions
cartUpdates[i].ProductId = Convert.ToInt32(rowValues["ID"]);
CheckBox cbRemove = new CheckBox();
cbRemove = (CheckBox)CartList.Rows[i].FindControl("RemoveItem");
cartUpdates[i].RemoveItem = cbRemove.Checked;
TextBox quantityTextBox = new TextBox();
quantityTextBox = (TextBox)CartList.Rows[i].FindControl("PurchaseQuantity");
cartUpdates[i].PurchaseQuantity = Convert.ToInt16(quantityTextBox.Text.ToString());
}
usersShoppingCart.UpdateShoppingCartDatabase(cartId, cartUpdates);
CartList.DataBind();
//dispaly updated total value
LblTotal.Text = String.Format("{0:c}", usersShoppingCart.GetTotal());
return usersShoppingCart.GetCartItems();
}
}
public static IOrderedDictionary GetValues(GridViewRow row)
{
try
{
IOrderedDictionary values = new OrderedDictionary();
foreach (DataControlFieldCell cell in row.Cells)
{
if (cell.Visible)
{
// Extract values from the cell.
cell.ContainingField.ExtractValuesFromCell(values, cell, row.RowState, true);
}
}
return values;
}
catch (Exception exp)
{
throw new Exception("ERROR1" + exp.Message.ToString(), exp);
}
}
protected void UpdateBtn_Click(object sender, EventArgs e)
{
UpdateCartItems();
}
protected void Button1_Click(object sender, EventArgs e)
{
Label1.Text = "IT is working ";
}
}
}
Source Code:
<%# Page Title="" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="ShowCart.aspx.cs" Inherits="Celebreno.ShowCart" %>
<asp:Content ID="Content1" ContentPlaceHolderID="MainContent" runat="server">
<div id="ShoppingCartTitle" runat="server" class="ContentHead"><h1>Shopping Cart</h1></div>
<%--Start of the GridView to display the items in the cart--%>
<asp:GridView ID="CartList" runat="server" AutoGenerateColumns="False" ShowFooter="True" GridLines="Vertical" CellPadding="4"
ItemType="Celebreno.Models.ItemsInCart" SelectMethod="GetShoppingCartItems"
CssClass="table table-striped table-bordered" >
<Columns>
<%--problem solved : change "ID" to "ServicePack.ID"--%>
<asp:BoundField DataField="ServicePack.ID" HeaderText="Service Package ID" SortExpression="ID" />
<asp:BoundField DataField="ServicePack.Provider" HeaderText="Provider" />
<asp:BoundField DataField="ServicePack.UnitPrice" HeaderText="Price (each)" DataFormatString="{0:c}"/>
<asp:TemplateField HeaderText="Quantity">
<ItemTemplate>
<asp:TextBox ID="PurchaseQuantity" Width="40" runat="server" Text="<%#: Item.Quantity %>"></asp:TextBox>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Item Total">
<ItemTemplate>
<%#: String.Format("{0:c}", ((Convert.ToDouble(Item.Quantity)) * Convert.ToDouble(Item.ServicePack.UnitPrice)))%>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Remove Item">
<ItemTemplate>
<%--checkbox for removing the item--%>
<asp:CheckBox id="Remove" runat="server"></asp:CheckBox>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
<%--End of the GridView--%>
<div>
<p></p>
<strong>
<%--2 (display the total of the cart--%>
<asp:Label ID="LblTotalText" runat="server" Text="Order Total: "></asp:Label>
<asp:Label ID="LblTotal" runat="server" EnableViewState="false"></asp:Label>
</strong>
</div>
<br />
<table>
<tr>
<td>
<%--3 ( add update button) --%>
</td>
<td>
<asp:Button ID="UpdateBtn" runat="server" Text="Button" OnClick="UpdateBtn_Click" />
<asp:Button ID="Button1" runat="server" Text="Test" OnClick="Button1_Click" />
<asp:Label ID="Label1" runat="server" Text="Test"></asp:Label>
</td>
</tr>
</table>
</asp:Content>

solved : by adding two attributes as shown below
<asp:Button ID="UpdateBtn" runat="server" OnClick="UpdateBtn_Click" Text="Button" CausesValidation="False" UseSubmitBehavior="false" />

gridview can't add after clearing

I am using entity framework and taking my datas from database and fill my gridview with them.Datas selected by user from a treview.Simply, user selects a data from treeview and I put it to gridview. Lastly I have a button for clearing the gridview. Here is my aspx:
<div id="divPrint" style="background-color: white" runat="server">
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<p style="text-align:center">HDCVI KAMERA FİYAT TEKLİFİDİR</p>
<asp:GridView ID="GridViewHdcvi" runat="server" DataSourceID="EntityDataSourceHdcvi" AutoGenerateColumns="False">
<Columns>
<asp:TemplateField HeaderText="ÜRÜN VE DETAYLARI">
<ItemStyle Width="400px" />
<ItemTemplate>
<div style="color: red" class="text-center"><%#Eval("UrunAdi") %></div>
<%#Eval("UrunDetay") %>
</ItemTemplate>
</asp:TemplateField>
<asp:ImageField HeaderText="ÜRÜN GÖRSELİ" DataImageUrlField="UrunResim"></asp:ImageField>
<asp:TemplateField HeaderText="BİRİM FİYAT">
<ItemTemplate>
<%#Eval("UrunFiyati") %>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="ADET">
<ItemTemplate>
<asp:TextBox ID="txtAdet" runat="server" Width="40px"></asp:TextBox>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
</ContentTemplate>
</asp:UpdatePanel>
</div>
<asp:Button ID="btnListiSifirla" runat="server" Text="Listeyi Sıfırla" CssClass="btn btn-danger" OnClick="btnListiSifirla_Click" />
And my codebehind:
static List<string> urunList = new List<string>();
protected void TreeView1_SelectedNodeChanged(object sender, EventArgs e)
{
string id = TreeView1.SelectedValue;
urunList.Add(id);
listeyiDoldur();
}
protected void listeyiDoldur()
{
if (urunList.Count == 0)
{
failDiv.Visible = true;
}
else
{
string query = "SELECT UrunTable.UrunAdi, UrunTable.UrunFiyati, UrunTable.UrunResim, UrunTable.UrunKategori, UrunTable.UrunDetay FROM UrunTable WHERE ";
foreach (var val in urunList)
{
if (val.Equals(urunList[urunList.Count - 1]))
{
query += "UrunTable.UrunId = " + val;
}
else
{
query += "UrunTable.UrunId = " + val + " || ";
}
}
EntityDataSourceHdcvi.CommandText = query;
divPrint.Visible = true;
btnListiSifirla.Visible = true;
}
}
protected void btnListiSifirla_Click(object sender, EventArgs e)
{
urunList.Clear();
btnListiSifirla.Visible = false;
Page_Load(null,EventArgs.Empty);
}
I can successfully display selected datas in gridview and clear them when button is pressed. Here is the problem: After clearing the gridview I can't add the last added item again.For example if I add item1,item2 and item3 in this order,after clearing the gridview I can't add item3. I can add item1 or item2, then item3. I can't add item firstly which I added last before clearing. I tried clearing gridview in button's onClick and tried other lots of things but nothing gave any result. Thanks for your time.

Validators array work only first time with asp.net gridview IN GOOGLE CHROME?

I noticed it works perfectly in Internet explorer, but not in Google Chrome!
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
Button saveBtn = (Button)e.Row.FindControl("btnSave");
CompareValidator validatorNow = (CompareValidator)e.Row.FindControl("DateValidator1");
saveBtn.ValidationGroup = "mygroupnow" + e.Row.RowIndex;
validatorNow.ValidationGroup = "mygroupnow" + e.Row.RowIndex;
saveBtn.Attributes.Add("onclick", "AllValidators('"+ e.Row.RowIndex + "');");
}
}
I have a gridview with a template, one column has a textbox with validator, and there's a column with a 'save' submit button. I give them a mutual validationGroup name using their row index. I also have update panel on my page, so until now the only way I could disable/enable a button after validating was with javascript. so I created the following method, to check on client click if the validator is valid:
function AllValidators(index) {
var currentValidationGroup = 'mygroupnow' + index;
for (i = 0; i < Page_Validators.length; i++) {
if (i == index) { if (Page_Validators[i].validationGroup == currentValidationGroup) { ValidatorValidate(Page_Validators[i], currentValidationGroup);
if (Page_Validators[i].isvalid) { alert('Validated!'); } else {alert('not Valid'); } } }
}
}
Now, this works great, but only for the first index... index 0, when i = 0, then the alerts really go off according to if it is validated or not, but for the other gridview rows, it just always returns 'Validated', even when it is not. I don't understand whats wrong, the code clearly works since it works the first time, so why not the others too?
and the gridview code :
<asp:GridView ID="GridView1" runat="server" DataSourceID="ds_OpenOrders" OnSelectedIndexChanged="Grid_SelectedIndexChanged"
onrowcreated="GridView1_RowCreated" CssClass="gridBx"
onprerender="GridView1_PreRender" onrowupdated="GridView1_RowUpdated"
onrowupdating="GridView1_RowUpdating" OnRowCommand="GridView1_RowCommand"
onrowdatabound="GridView1_RowDataBound" CellPadding="3" ForeColor="#333333" GridLines="None" AutoGenerateColumns="False" AllowPaging="true" DataKeyNames ="RschEstTime,DRNLoanNumber" PageSize="8" Width="859px" ShowFooter="True">
<AlternatingRowStyle BackColor="White"/>
<Columns>
<asp:TemplateField HeaderText="Est Return Date" SortExpression="RschEstDate" HeaderStyle-VerticalAlign="Top">
<ItemTemplate>
<asp:TextBox ID="txtReturnDate1" runat="server" TabIndex="1" Text='<%# Bind("RschEstDate", "{0:MM/dd/yyyy}") %>' Width="70px" AutoPostBack="True" OnTextChanged="GlobalControl_Changed"></asp:TextBox>
<asp:CompareValidator ID="DateValidator1" runat="server" Type="Date" Operator="DataTypeCheck" ErrorMessage="Wrong Format" ControlToValidate="txtReturnDate1" Text="*" Display="Static" EnableClientScript="true"></asp:CompareValidator>
</ItemTemplate>
<asp:TemplateField
<ItemTemplate>
<asp:Button ID="btnSave" runat="server" Text="Save" CommandName="Update" CausesValidation="true" OnClick="MyBtnClick"/>
</ItemTemplate>
</asp:TemplateField>
</Columns>
I've also tried doing simpler action in javascript, without the whole loop of Page_validators, and just tried this :
function NextTry(validationName) {
if (Page_ClientValidate(validationName)) { alert('yesss'); } else { alert('noooo'); }
}
or
function NextTry(index) {
if(Page_ClientValidate('mygroupnow' + index)) { alert('Valid!');} else { alert('Not Valid'); } }
}
and again, same problem, it works for the first row, index 0, it alerts really according to that row validation, for the others, it always returns 'Valid', even when it is not.

I haven't tested it. But, a similar code works for my project.
function AllValidators(index) {
var currentValidationGroup = 'mygroupnow' + index;
$("#<%=gdRows.ClientID%> tr").each(function() {
for (i = 0; i < Page_Validators.length; i++) {
if (i == index) { if (Page_Validators[i].validationGroup == currentValidationGroup) { ValidatorValidate(Page_Validators[i], currentValidationGroup);
if (Page_Validators[i].isvalid) { alert('Validated!'); } else {alert('not Valid'); } } }
}
}
}
loop through your gridview rows individually and check the validators.. A similar example is addressed here.

Gridview rowdatabound error : Multiple controls with the same ID 'hlLink' were found. FindControl requires that controls have unique ID

I have a gridview that has link and description to be rendered on the page.
written the below code in gridview in .aspx
<Columns>
<asp:TemplateField>
<ItemTemplate>
<p>
<asp:HyperLink ID="hlLink" runat="server" Target="_self"></asp:HyperLink></p>
</ItemTemplate>
<ItemTemplate>
<p>
<asp:Literal ID="litSummary" runat="server"></asp:Literal></p>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField>
<AlternatingItemTemplate>
<p>
<asp:HyperLink ID="hlLink" runat="server" Target="_self"></asp:HyperLink></p>
</AlternatingItemTemplate>
<AlternatingItemTemplate>
<p>
<asp:Literal ID="litSummary" runat="server"></asp:Literal></p>
</AlternatingItemTemplate>
</asp:TemplateField>
</Columns>
and below in .aspx.csin gridview rowdataboundevent
protected void gvResults_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
SearchResultItem data = (SearchResultItem)e.Row.DataItem;
HyperLink hlLink = (HyperLink)e.Row.FindControl("hlLink");
Literal litSummary = (Literal)e.Row.FindControl("litSummary");
if (data.Description != null)
{
hlLink.Text = data.Title;
hlLink.NavigateUrl = data.Path.Replace("&", "&");
litSummary.Text = data.Description;
}
else
{
hlLink.Text = data.Path;
hlLink.NavigateUrl = data.Path.Replace("&", "&");
litSummary.Text = data.Path;
}
}
here SearchResultItem: is the result item that has link and description details.
First time when row bound event is called, it binds the data correctly, second time when called throws error "Multiple controls with the same ID 'hlLink' were found. FindControl requires that controls have unique IDs.
Please let me know whats error with the code.
Thanks

Problem : you are trying to create the same controls with same ID multiple times.
Solution : you need to remove the controls before creating them.
Try This:
void RemoveControls()
{
HyperLink l1 = (HyperLink)Page.FindControl("hlLink");
Literal l2 = (Literal)Page.FindControl("litSummary");
if(l1!= null)
Page.Controls.Remove(l1);
if(l2!= null)
Page.Controls.Remove(l2);
}
Solution 2: Pagination for Repeater control.
for implementing pagination in Repeater control you need to create PagedDataSource.
Try This:
PagedDataSource pds = new PagedDataSource();
pds.DataSource = ds.Tables[0].DefaultView;
pds.AllowPaging = true;
pds.PageSize = 8;//page sizes

Grid view row command is firing after every second click

I've shopping cart in grid view. The grid is in update panel with update mode always. The grid view is itself in a user control and this user control renders in a child page (GridView --> User Control --> Child aspx page --> master page). Whenever I click on any button to modify cart the gridview row command not fires first time but when I again click on the button second time the row command fires correctly. Now I don't know why the row command event is not firing on first click and it is firing only on every even click (second click).
ASP:
<asp:GridView ID="GVCart" runat="server" AutoGenerateColumns="False" OnRowCommand="CartUpdate">
<Columns>
<asp:BoundField DataField="Product_Name" HeaderText="Product Name">
</asp:BoundField>
<asp:TemplateField>
<ItemTemplate>
<asp:ImageButton ID="Button3" runat="server" CommandArgument='<%# Eval("Product_ID") %>'
CommandName="DecreseCartQty" Height="20px" ToolTip="Minus" AlternateText="+" />
<asp:ImageButton ID="ImageButton1" runat="server" CommandArgument='<%# Eval("Product_ID") %>'
CommandName="IncreaseCartQty" Height="20px" ToolTip="Add" AlternateText="-" />
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField>
<ItemTemplate>
<asp:Label ID="ABC" runat="server" Text='<%# Eval("ItemQTY")+" * "+Eval("Price")+" = "+Eval("TotalPrice") %> '></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField>
<ItemTemplate>
<asp:ImageButton ID="Button4" runat="server" CommandArgument='<%# Eval("Product_ID") %>' CommandName="Remove" ToolTip="Cancel"/>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
C#: (in user control)
protected void CartUpdate(object sender, GridViewCommandEventArgs e)
{
if (e.CommandName == "IncreaseCartQty")
{
int ProductId = Convert.ToInt32(e.CommandArgument.ToString());
DataTable CartDT = (DataTable)Session["cart"];
for (int i = 0; i < CartDT.Rows.Count; i++)
{
if (CartDT.Rows[i]["Product_ID"].ToString() == ProductId.ToString())
{
CartDT.Rows[i]["ItemQTY"] = Convert.ToInt32(CartDT.Rows[i]["ItemQTY"]) + 1;
CartDT.Rows[i]["TotalPrice"] = Convert.ToInt32(CartDT.Rows[i]["Price"]) * Convert.ToInt32(CartDT.Rows[i]["ItemQTY"]);
//Page.Response.Redirect(Page.Request.Url.ToString(), true);
}
}
}
if (e.CommandName == "DecreseCartQty")
{
int ProductId = Convert.ToInt32(e.CommandArgument.ToString());
DataTable CartDT = (DataTable)Session["cart"];
for (int i = 0; i < CartDT.Rows.Count; i++)
{
if (CartDT.Rows[i]["Product_ID"].ToString() == ProductId.ToString())
{
if (Convert.ToInt32(CartDT.Rows[i]["ItemQTY"]) > 1)
{
CartDT.Rows[i]["ItemQTY"] = Convert.ToInt32(CartDT.Rows[i]["ItemQTY"]) - 1;
CartDT.Rows[i]["TotalPrice"] = Convert.ToInt32(CartDT.Rows[i]["Price"]) * Convert.ToInt32(CartDT.Rows[i]["ItemQTY"]);
// Page.Response.Redirect(Page.Request.Url.ToString(), true);
}
}
}
}
if (e.CommandName == "Remove")
{
int ProductId = Convert.ToInt32(e.CommandArgument.ToString());
DataTable CartDT = (DataTable)Session["cart"];
for (int i = 0; i < CartDT.Rows.Count; i++)
{
if (CartDT.Rows[i]["Product_ID"].ToString() == ProductId.ToString())
{
CartDT.Rows.RemoveAt(i);
//Page.Response.Redirect(Page.Request.Url.ToString(), true);
}
}
}
}
Can anyone tell me what wrong I am doing. Your answer will be great help for me.
Thanks in advance.

It is behaving properly. You should rebind the gridview after CartUpdate so that another post back is not required.
just add these lines after
if (e.CommandName == "Remove")
{
int ProductId = Convert.ToInt32(e.CommandArgument.ToString());
DataTable CartDT = (DataTable)Session["cart"];
for (int i = 0; i < CartDT.Rows.Count; i++)
{
if (CartDT.Rows[i]["Product_ID"].ToString() == ProductId.ToString())
{
CartDT.Rows.RemoveAt(i);
//Page.Response.Redirect(Page.Request.Url.ToString(), true);
}
}
}
DataTable CartDT = (DataTable)Session["cart"];
gridview1.datasource=CartDT ;
gridview1.databind();

Checkout this answer, I think it will solve your problem. If you have your grid view in user control this issue can arise. I had a same issue when I had my grid view in a user control.