DataGridView combobox problem

Hi,

   Consider This Function, It will add value from 0 to 99 to Passed Dropdown (Incase of Web) or ComboBox (Incase of Window Application).

   private void FillDropDownList(DropDownList ddl)            {
             for (int i=0 ; i<=100; i++)
                {
                    ddl.Items.Add( i );
                }
            }

 //Retrive Your Dropdown From GridView and then Pass to Function  (Change Your Cell Value according to your Gridview)

DropDownList ddl1 = (DropDownList)Gridview1.Rows[0].Cells[3].FindControl("DropDownList1");  //Dropdown name
                FillDropDownList(ddl1);


For your reference, i attached my Source Here. Hope It will be useful for you.
Thank You