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In one of my previous posts, I had shown how to Check Uncheck all CheckBoxes in an ASP.NET GridView using jQuery
Users mailed back telling me that the example did not work in an UpdatePanel. I suspect the error they got was this:
“Sys.WebForms.PageRequestManagerParserErrorException: The message received from the server could not be parsed. Common causes for this error are when the response is modified by calls to Response.Write(), response filters, HttpModules, or server trace is enabled”
The reason why this error occurs has been given very clearly over here
Here’s how to solve it:
1. Wrap the GridView and the Button in an Update Panel
2. Add a Literal control to the Page
<asp:Literal ID="lblResults" runat="server" Text=""></asp:Literal>
3. Instead of using Response.Write(), write the results to this Literal control
C#
protected void btnRetrieveCheck_Click(object sender, EventArgs e)
{
foreach (GridViewRow row in GridView1.Rows)
{
CheckBox cb = (CheckBox)row.FindControl("chkSel");
if (cb != null && cb.Checked)
{
lblResults.Text += "Employee Id: " +
GridView1.DataKeys[row.RowIndex].Value
+ " Name: " + row.Cells[2].Text + "<br/>";
}
}
}
VB.NET
Protected Sub btnRetrieveCheck_Click(ByVal sender As Object, _
ByVal e As EventArgs)
For Each row As GridViewRow In GridView1.Rows
Dim cb As CheckBox = CType(row.FindControl("chkSel"), CheckBox)
If cb IsNot Nothing AndAlso cb.Checked Then
lblResults.Text &= "Employee Id: " & _
GridView1.DataKeys(row.RowIndex).Value & " Name: " & _
row.Cells(2).Text & "<br/>"
End If
Next row
End Sub
