Question

Am trying to add to the navigation url in a hyperlink field.

I have 5 columns on my gridview, the last being

  <asp:HyperLinkField DataNavigateUrlFields="vID" 
            DataNavigateUrlFormatString="Page2.aspx?field={0}" HeaderText="send" 
            Text="send"></asp:HyperLinkField>

and the code behind to add to it

Protected Sub GridView1_RowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles GridView1.RowDataBound

    Dim hk As HyperLink = DirectCast(e.Row.Cells(4).Controls(0), HyperLink)
    hk.NavigateUrl += "&TN=table1"

End Sub

I had it working yesterday, but must have accidentally deleted the code, and I cant find where am going wrong here, I get an error “Specified argument was out of the range of valid values.
Parameter name: index”

Answer 1

You must check the RowType, otherwise you’re looking for the HyperLink also in the header.

VB

Protected Sub GridView1_RowDataBound(sender As Object, e As GridViewRowEventArgs )
    If e.Row.RowType = DataControlRowType.DataRow Then
        Dim link = DirectCast(e.Row.Cells(4).Controls(0), HyperLink)
        link.NavigateUrl &= "&TN=table1"
    End If
End Sub

C#

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        HyperLink link = (HyperLink)e.Row.Cells[4].Controls[0];
        link.NavigateUrl += "&TN=table1";
    {
}