thank for your time:
I have this code:
Protected Sub Button_Click(ByVal sender As Object, ByVal e As EventArgs) Handles Button.Click
Try
Dim chk As CheckBox
For Each rowItem As GridViewRow In GridView1.Rows
chk = DirectCast(rowItem.Cells(0).FindControl("chk1"), CheckBox)
' chk.checked will access the checkbox state value (on button click event)
If chk.Checked Then
Response.Write(GridView1.DataKeys(rowItem.RowIndex)("Exporta").ToString() & "<br />")
End If
Next
Catch ex As Exception
MsgBox(ex.Message)
End Try
End Sub
this is the error:
System.NullReferenceException: Object reference not set to an instance of an object.
Please help me.
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