Question

I am having quite a hard time with my C# Application’s textbox validation. The thing is, the said textbox should only accept decimal values. so it means, there should be no letters or any other symbols aside from the ‘.’ symbol. The letter filter, i can handle. However, i don’t exactly know how I can manage to filter the number of ‘.’ that the textbox should accept. If anybody has any idea how to do this, please give me an idea.

Thank you very much 🙂

Answer 1

this should work!!!

modified for just one decimal

    private void txtType_KeyPress(object sender, KeyPressEventArgs e)
    {
        if (e.KeyChar == (char)Keys.Back || (e.KeyChar == (char)'.') && !(sender as TextBox).Text.Contains("."))
        {
            return;
        }
        decimal isNumber = 0;
        e.Handled = !decimal.TryParse(e.KeyChar.ToString(), out isNumber);
    }