data grid view combobox postioning the particular cell

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C#

i tried as follows;

when i run the combo box positioning to the left.then i want to select combo box another column i have to press enter key that combo box positioning to particular cell.

for that positioning i write the code as follows;

private void cb_Course_KeyPress(object sender, KeyEventArgs e)
        {
          if (e.KeyCode == Keys.Enter)

          datagridView.CurrentCell.ColumnIndex.ToString();
      }

it is not working please kindly check my code .i tired then only i post this question please help me.

private void datagridViewInitializationMethod()
         {
  datagridView.EditingControlShowing += new     DataGridViewEditingControlShowingEventHandler(dataGridView_EditingControlShowing);
}

      private void dataGridView_EditingControlShowing(object sender,

    DataGridViewEditingControlShowingEventArgs e)
        {
            e.Control.KeyPress += new KeyPressEventHandler(Control_KeyPress);
        }

        private void Control_KeyPress(object sender, KeyPressEventArgs e)
        {
            if (char.IsNumber(e.KeyChar))
            {

            }

        }


private void datagridView_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
        {
 DataGridViewTextBoxEditingControl tb = (DataGridViewTextBoxEditingControl)e.Control;
            tb.KeyPress += new KeyPressEventHandler(dataGridViewTextBox_KeyPress);
            e.Control.KeyPress += new KeyPressEventHandler(dataGridViewTextBox_KeyPress);
        }

private void dataGridViewTextBox_KeyPress(object sender, KeyPressEventArgs e)
       {
           //when i press enter,bellow code never run?
           if (e.KeyChar == 32) //space
           {

               this.cb_Course.Top = Convert.ToInt32(datagridView.CurrentCellAddress.X.ToString()) * 10;
               this.cb_Course.Left = Convert.ToInt32(datagridView.CurrentCellAddress.Y.ToString()) * 10;

           }
           else
           {
               e.KeyChar = '';
           }
       }

help me see my above code.what is wrong my code.