Error Referencing GridView Template RangeValidator

BobRoberts · November 5th, 2011, 05:29 PM

Like many people, I'm trying to dynamically set the MaximumValue and MinimumValue of the RangeValidator of a GridView template to other column values in the gridview. After much searching, I found a few examples that I am trying to use, but am getting an "Object reference not set to an instance of an object" on the code-behind line starting with "(e.Row.FindControl("RangeValidator1")...". The remarked-out line above it gives the same error.

Here is the code:

Code:

        <EditItemTemplate>
          <asp:TextBox ID="TextBox1" runat="server" 
            Text='<%# Bind("QTY_ORD", "{0:#,###}") %>'></asp:TextBox>

          <asp:RangeValidator ID="RangeValidator1" Runat="server" 
          ErrorMessage="Order Quantity outside of MIN/MAX range."
          MaximumValue="333" MinimumValue="111" 
          Type = "Integer"  
          ControlToValidate="TextBox1">*</asp:RangeValidator> 
                  
        </EditItemTemplate>

Code:

  protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
  {
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
   //   (e.Row.FindControl("RangeValidator1") as RangeValidator).MaximumValue = e.Row.Cells[5].Text.Trim();
      (e.Row.FindControl("RangeValidator1") as RangeValidator).MaximumValue = "999";
    } 
  }