private void DataGridView1_CellMouseDown(object sender, DataGridViewCellMouseEventArgs e)
  {
            if (e.RowIndex >= 0)
            {
                if (e.Button == System.Windows.Forms.MouseButtons.Right)
                {
                     dataGridView1.CurrentCell = dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex];
                    //this.DataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Selected = true;
                }
            }
  } 
                    
                
                
            
        
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