I'm using Telerik.WinControls.GridView version 2012.2.912.40.

I validate a cell value in cell validating event.

I set e.Cancel = true in CellValidating event and then delete row of that cell with a command cell click event.

when the gridview's row count reach to zero and double click the gridview error occur "Exception thrown: 'System.NullReferenceException' in Telerik.WinControls.GridView.dll".

private void gvStockItemDetail_CellValidating(object sender, CellValidatingEventArgs e)
{

 if (!string.IsNullOrEmpty(Convert.ToString(e.Row.Cells["Stock ID"].Value)) && column.Name == "Quantity")
  {
    if (Convert.ToDecimal(string.IsNullOrEmpty(Convert.ToString(e.Value)) ? 0 : e.Value) <= 0)
     {
       e.Cancel = true;
       e.Row.Cells["Quantity"].BeginEdit();
       e.Row.ErrorText = BOL_Global_Message.STOCK.Msg_Quantity;                      
     }
    else
     {
       e.Row.ErrorText = string.Empty;
     }
   }

}

private void gvStockItemDetail_CommandCellClick(object sender, EventArgs e)
{
   if (gvStockItemDetail.CurrentRow.Index >= 0)
   {
    gvStockItemDetail.Rows.RemoveAt(gvStockItemDetail.CurrentRow.Index);

   }

}

Hello Dimitar,

I make some changes to your sample and test it.

I found error . I delete a record to set e.Cancel = true; on a cell and then delete all rows of the grid.

When all row records clear and make a click on Delete column's header text.

Then I make double click on the blank of the grid.

It is occurs.

Please see my link. I can't attach the project.

https://drive.google.com/open?id=0BzxUL26eMScAMTc4aGVrV3VUZVk

Regards

Myo

Hi Dimitar,

I have seen this.

I'm using version 2012.2.912.40.

Please make a cell to it's e.Cancel value true; and then delete row without changes e.Cancel's value.

eg. Delete a cell's content which validate in cell validation event and press enter key to set e.Cancel's value true.

I think error occurs due to missing cell which has e.Cancel value true. Because we delete it and when gridview's row count is zero and double click grid.

Regards,

Myo

Hi Dimitar,

I added new class like the following.

Show error 'MyGrid.OnMouseDoubleClick(MouseEventArgs)': no suitable method found to override.

Please help me.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Telerik.WinControls.UI;
using Telerik.WinControls;
using Telerik.WinControls.Data;

namespace TestingProject
{
    class MyGrid : RadGridView
    {
        protected override void OnMouseDoubleClick(MouseEventArgs e)
        {
            if (this.CurrentCell == null)
            {
                return;
            }

            base.OnMouseDoubleClick(e);
        }
    }

}

Regards,

Myo

Hi Dimitar,

It is ok.

Thank you a lot.

Regrads,

Myo