Solution
Step 1
Paste this code on export button click.
Protected Sub imgExport_Click(ByVal sender As Object, ByVal e As System.Web.UI.ImageClickEventArgs) Handles imgExport.Click
Response.Clear()
Response.AddHeader("content-disposition", "attachment;filename=filename.xls")
Response.Charset = ""
Response.ContentType = "application/vnd.xls"
Dim stringWrite As New StringWriter
Dim htmlWrite As New HtmlTextWriter(stringWrite)
grid.AllowSorting = False
grid.AllowPaging = False
subBindGrid()
grid.RenderControl(htmlWrite)
Response.Write(stringWrite.ToString())
Response.End()
grid.AllowSorting = True
grid.AllowPaging = True
subBindGrid()
End Sub
If u run this code now, you will get error - 'Control 'ctl00_ContentPlaceHolder1_grid' of type 'GridView' must be placed inside a form tag with runat=server'. so, Don't worry. Just follow Step 2.
Step 2
Just copy and paste the below code. Its done.
Public Overrides Sub VerifyRenderingInServerForm(ByVal control As Control)
' Confirms that an HtmlForm control is rendered for the specified ASP.NET
' server control at run time.
End Sub
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