Datagrid RowDeleting event is fired twice while browsing with IE

[Amara Cabreja]

Hi

I have a datagrid and and I wrote some code for the RowDeleting event.

While I was developing I tested with Firefox and everything was fine, but since I have potential users that are still using IE6 I started testing with it and then I received the following exception:

System.ArgumentNullException was unhandled by user code
  Message="Value cannot be null.\r\nParameter name: entity"
  Source="ReportPortal"
  ParamName="entity"
  StackTrace:
       at ReportPortal.Views.Admins.Roles.DeleteRole(Int32 roleId) in C:\ReportPortal\Views\Admins\Roles.aspx.cs:line 71
       at ReportPortal.Views.Admins.Roles.gvRoles_RowDeleting(Object sender, GridViewDeleteEventArgs e) in C:\ReportPortal\Views\Admins\Roles.aspx.cs:line 323
       at System.Web.UI.WebControls.GridView.OnRowDeleting(GridViewDeleteEventArgs e)
       at System.Web.UI.WebControls.GridView.HandleDelete(GridViewRow row, Int32 rowIndex)
       at System.Web.UI.WebControls.GridView.HandleEvent(EventArgs e, Boolean causesValidation, String validationGroup)
       at System.Web.UI.WebControls.GridView.RaisePostBackEvent(String eventArgument)
       at System.Web.UI.WebControls.GridView.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument)
       at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument)
       at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData)
       at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
  InnerException: 
 

When I traced the code I realized that RowDeleting Event is been fired twice. The first one deletes the row and the second one, of course, fails. But in FF it works OK so , I can't figure why when I change the browser the event is fired 2 times. Any idea???

This is my code:

protected void gvRoles_RowDeleting(object sender, GridViewDeleteEventArgs e)
        {
         DeleteRole(Convert.ToInt32(gvRoles.DataKeys[e.RowIndex].Value));
            }
 
 
private void DeleteRole(int roleId)
        {
            CNNDemoDataContext db = new CNNDemoDataContext();
 
            var matchedRole = (from role in db.STRoles
                               where role.RoleId == roleId
                               select role).SingleOrDefault();
 
            try
            {
                db.STRoles.DeleteOnSubmit(matchedRole);
                db.SubmitChanges();
            }
            catch (Exception ex)
            {
                throw ex;
            }
 
        }