Gridview Cell Validate with Numeric values

private void dGridView1_CellEndEdit(object sender, DataGridViewCellEventArgs e)
        {
            if (e.ColumnIndex == 0)              {
                string val = dGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Value.ToString();
                if (!(Microsoft.VisualBasic.Information.IsNumeric(val) || val.Contains(".")))
                {
                    MessageBox.Show("Please Enter Numberic value'.' character");
                    dGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].Value = String.Empty;
                }
            }
        }

<script type="text/javascript">
   function IsNumFieldKeyPress() {
     var element;
     element = event.srcElement;
     if (event.keyCode >= 48 && event.keyCode <= 57) {//to handle num 0 -9 
         event.returnValue = true;
         return;
     }
event.returnValue = false;
        }
</script>

private void grViewMedications_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
{
  var textControl = e.Control as DataGridViewTextBoxEditingControl;
  if (textControl != null)
  {
    textControl.KeyPress += new KeyPressEventHandler(textControl_KeyPress);
  }
 }
}

void textControl_KeyPress(object sender, KeyPressEventArgs e)
{
 if (!Char.IsNumber(e.KeyChar)  && (Keys)e.KeyChar != Keys.Back) 
 {
   e.Handled = true;
   MessageBox.Show("Please enter only numbers!!!");
 }
}