Check decimal value in DataGridView Cell

Question

I need to check if value in specific cell in DataGridView is correctly entered?

In CellFormating event I have:

if (e.ColumnIndex == 4)
{
    string deger = (string)e.Value;
    deger = String.Format("{0:0.00}", deger);
}

And DefaultCellStyle is formated like:

dgLog.Columns[4].DefaultCellStyle.Format = "n2";

But this still allows user to enter whatever he want. How to handle cell to allow entering only numbers with one decimal point?

Answer 1

Add an event of EditingControlShowing In EditingControlShowing , check that if the current cell lies in the desired column. Register a new event of KeyPress in EditingControlShowing (if above condition is true).Remove any KeyPress event added previously in EditingControlShowing . In KeyPress event, check that if key is not digit then cancel the input.

private void dataGridView1_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
{
   e.Control.KeyPress -= new KeyPressEventHandler(Column1_KeyPress);
   if (dataGridView1.CurrentCell.ColumnIndex == 0) //Desired Column
   {
      TextBox tb = e.Control as TextBox;
      if (tb != null)
      {
        tb.KeyPress += new KeyPressEventHandler(Column1_KeyPress);
      }
    }
}

private void Column1_KeyPress(object sender, KeyPressEventArgs e)
{
   if (!char.IsControl(e.KeyChar)
       && !char.IsDigit(e.KeyChar))
    {
        e.Handled = true;
    }
}

Answer 2

You could use the DataGridView CellValidating event to perform data validation in general. See MSDN-1 and MSDN-2 .