Textbox validation

simple...use regular expression validator.

Hello,

Kindly find the regular expression for allowing numbers in textbox below:
Regex.IsMatch(txtbox.Text, @"^\d+$");
Kindly, let me know if you need further help!

Thanks,
Paras Sanghani
Mark As Answer if it helped you.

Now TextBox in Windows application of C# have something called as events
all u have to do is use the KeyPress event of the textbox and paste in the following code...

The below code will work with integers a better option would be to use regular expression

private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
        {
            //only numbers code

            if (char.IsNumber(e.KeyChar) == false)
            {
                e.Handled = true;
            }
            //backspace workin keycode
            if (e.KeyChar == (char)Keys.Back)
            {
                e.Handled = false;
            }
            //if u want that alphabets must be entered then just use
           // char.IsLower in place of char.IsNumber
        }

and ur done...

Do rate my answer once u find it useful

Thanks & Regards
Radix :rose: