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When I import the data from List<> to excel it autometically add the border in a excel file.How to remove that Border from excel file?

I have used the below code. importing the data from List<> to excel works fine but it add the Black line border into a excel file.how can I remove that border from excel file ?
if (id != null)
{
int mid = Convert.ToInt32(clsPasswordHelper.Decryptdata(id));
var objMySavedMedicinePricesResults = db.MedicineRequestDownload(mid).ToList();
GridView gv = new GridView();
gv.DataSource = objMySavedMedicinePricesResults;
gv.DataBind();
Response.ClearContent();
Response.Buffer = true;
Response.AddHeader("content-disposition", "attachment; filename=" + DateTime.Now.ToShortDateString() + "_MedicinePrice.xls");
Response.ContentType = "application/ms-excel";
Response.Charset = "";
StringWriter sw = new StringWriter();
HtmlTextWriter htw = new HtmlTextWriter(sw);
gv.RenderControl(htw);
Response.Output.Write(sw.ToString());
Response.Flush();
Response.End();
return Json(new { success = true }, JsonRequestBehavior.AllowGet);
}

The way you've used generate html output and client open html file as excel.On this way you can't style excel cells and table.
Use ClosedXML library.with this library you can create a valid excel file and you'll able to modify the style of exported excel.
Example code:
var workbook = new XLWorkbook();
var worksheet = workbook.Worksheets.Add("Sample Sheet");
worksheet.Cell("A1").Value = "Hello World!";
workbook.SaveAs("HelloWorld.xlsx");

How to display gridLines in GridView from code behind

In aspx code i set GridLines="None"
How can i show GridLines from code behind when exporting grid-view to excel file.
protected void btnexcel_Click(object sender, EventArgs e)
{
Response.Clear();
Response.Buffer = true;
Response.AddHeader("content-disposition",
"attachment;filename=UsersReport.xls");
Response.Charset = "";
Response.ContentType = "application/vnd.ms-excel";
StringWriter sw = new StringWriter();
HtmlTextWriter hw = new HtmlTextWriter(sw);
gridusers.DataBind();
gridusers.RenderControl(hw);
//style to format numbers to string
string style = #"<style> .textmode { mso-number-format:\#; } </style>";
Response.Write(style);
Response.Output.Write(sw.ToString());
Response.Flush();
Response.End();
}

In function start, set:
grdAdslCompanyAdvisers.GridLines = GridLines.Both;
after export again
grdAdslCompanyAdvisers.GridLines = GridLines.None;
Hope this helps or gives you an idea.

GridView Export to PDF Error Not Supported

Here is my Export ActionResult to PDF:
List<DailySum> lstDailySum = db.DailySum.Include(x => x.codeACl).Include(x => x.codeCou).Include(x => x.codeAgc).Include(x => x.AInfo).ToList();
GridView gv = new GridView();
if (Session["Paging"] == null)
{
gv.DataSource = lstDailySum;
}
else
{
gv.DataSource = Session["Paging"];
}
gv.DataBind();
Response.ClearContent();
Response.Buffer = true;
Response.AddHeader("content-disposition", "attachment; filename=DailySumExport.pdf");
Response.ContentType = "application/pdf";
Response.Charset = "";
StringWriter sw = new StringWriter();
HtmlTextWriter htw = new HtmlTextWriter(sw);
gv.RenderControl(htw);
Response.Output.Write(sw.ToString());
Response.Flush();
Response.End();
Now this works fine when I try and export to Excel but when I try and export to PDF I get this error message:
Adobe Acrobat Reader DC could not open 'DailySumExport.pdf' because it is either not supported file type or because the file has been damaged (for example, it was sent as an email attachment and wasn't correctly decoded).
Any help on how to resolve this issue would be greatly appreciated.
Thanks.

export html file to excel using asp.net

Can anybody help me I am a beginner and have no concept how the conversion can be made.
Here is my code:
Response.Clear();
Response.AddHeader("Content-Disposition", "attachment;filename=" + filename + ".xls");
Response.ContentType = "application/vnd.ms-excel";
Response.Cache.SetCacheability(HttpCacheability.NoCache);
Response.Charset = "";
StringWriter sw = new StringWriter();
HtmlTextWriter hw = new HtmlTextWriter(sw);
Response.ContentEncoding = System.Text.Encoding.Unicode;
fuFile.RenderControl(hw);
Response.Output.Write(sw.ToString().Replace(" ", "").Replace("&", "&"));
Response.End();
Is this not enough to export an HTML file to Excel?

I have found this works:
String content = "<html><body><table><tr><td>your table</td></tr></table></body></html>";
Response.Clear();
Response.AddHeader("Content-Disposition", "attachment;filename=" + filename + ".xls");
Response.ContentType = "application/vnd.xls";
Response.Cache.SetCacheability(HttpCacheability.NoCache); // not necessarily required
Response.Charset = "";
Response.Output.Write(content);
Response.End();
As long as your content is well-formed HTML, this should work.
Also note that comments, VBA code/macros, and multiple work-sheets do not work with this method. Additionally any styling that is not inline will also not render.
And some other considerations on this matter:
How can I export tables to excel from a webpage
http://www.c-sharpcorner.com/UploadFile/ankurmalik123/export-html-to-excel-and-more/

Export to excel using asp.net

I am using following function to export my data to excel sheet:
string filename = "Test.xls";
System.IO.StringWriter tw = new System.IO.StringWriter();
System.Web.UI.HtmlTextWriter hw = new System.Web.UI.HtmlTextWriter(tw);
//Get the H`enter code here`TML for the control.
yourGrid.RenderControl(hw);
//Write the HTML back to the browser.
Response.ContentType = "application/vnd.ms-excel";
Response.AppendHeader("Content-Disposition", "attachment; filename=" + filename + "");
Response.Write(tw.ToString());
but excel sheet is not created. Although it shows in chrome browser bottom that excel is downloading. When it finishs downloading, I click it and it says file cant be opened. Please suggest me what is wrong in it?
[EDIT]
Response.Clear();
Response.Buffer = true;
//use Response.AddHeader
Response.AddHeader("content-disposition", "attachment;filename=Test.xlsx");
Response.Charset = "";
Response.ContentType = "application/vnd.ms-excel";
StringWriter sw = new StringWriter();
HtmlTextWriter hw = new HtmlTextWriter(sw);
gvLogs.RenderControl(hw);
gvLogs.AllowPaging = false;
gvLogs.DataBind(); // bind data
Response.Output.Write(sw.ToString());
//need to call Flush and End methods
Response.Flush();
Response.End();
give same error

Epplus is a good library for excel import/export. You can check it out.

You can try this one
private void ExportToExcel(DataTable dt)
{
if (dt.Rows.Count > 0)
{
string filename = "DownloadReport.xls";
System.IO.StringWriter tw = new System.IO.StringWriter();
System.Web.UI.HtmlTextWriter hw = new System.Web.UI.HtmlTextWriter(tw);
DataGrid dgGrid = new DataGrid();
dgGrid.DataSource = dt;
dgGrid.DataBind();
//Get the HTML for the control.
dgGrid.RenderControl(hw);
//Write the HTML back to the browser.
Response.ContentType = "application/vnd.ms-excel";
Response.AppendHeader("Content-Disposition", "attachment; filename=" + filename + "");
this.EnableViewState = false;
Response.Write(tw.ToString());
Response.End();
}
}

Change the 'Response.ContentType' value in your code as like below.
Response.ContentType = "application/vnd.xls";
Hope this will help you.

check below code
Response.Clear();
Response.Buffer = true;
//use Response.AddHeader
Response.AddHeader("content-disposition", "attachment;filename=Test.xls");
Response.Charset = "";
Response.ContentType = "application/vnd.xls";
StringWriter sw = new StringWriter();
HtmlTextWriter hw = new HtmlTextWriter(sw);
GridView1.RenderControl(hw);
GridView1.AllowPaging = false;
GridView1.DataBind(); // bind data
Response.Output.Write(sw.ToString());
//need to call Flush and End methods
Response.Flush();
Response.End();