Question

I need to make datagridview that only accept the numeric value for specific column only in keypress event. Is there any best way to do this?

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.

Example:

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;
    }
}