WinForm Textbox with decimal number validation

Question

How do you check if a user put a dot or comma in the textbox in my decimal number input, and how do I get the message that the error is in the lab if the input is incorrect when using a WinForm?

Answer 1

You haven't stated which language you are using. Is this what you're looking for?

c#

if (textBox1.Text.Contains(".") || textBox1.Text.Contains(","))
   {
       MyLabel1.Text = "Textbox Contains . or ,";
   }

You can just change the "MyLabel1.Text" to whatever your Label is called.