textbox validation for allow one “ . ” value c#

Question

I want textbox validation for allowing only one . value and only numbers. Means my textbox value should take only numerics and one . value. Value shoul

Answer 1

try this code and just replace what you want input type 'validinpu' string.

try
{
    short charCode = (short)Strings.Asc(e.KeyChar);
    string validinput = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-0123456789 .";
    if (Strings.InStr(validamt, Conversions.ToString(Strings.Chr(charCode)), Microsoft.VisualBasic.CompareMethod.Binary) == 0)
    {
        charCode = 0;
    }
    if (charCode == 0)
    {
        e.Handled = true;
    }
}