How to remove lowercase on a textbox?

Question

I'm trying to remove the lower case letters on a TextBox..

For example, short alpha code representing the insurance (e.g., 'BCBS' for 'Blue Cross Blue Shield'):

txtDesc.text = "Blue Cross Blue Shield";

string Code = //This must be BCBS.. 

Is it possible? Please help me. Thanks!

Answer 1

Well you could use a regular expression to remove everything that wasn't capital A-Z:

using System;
using System.Text.RegularExpressions;

class Program
{
    static void Main( string[] args )
    {
        string input = "Blue Cross Blue Shield 12356";
        Regex regex = new Regex("[^A-Z]");
        string output = regex.Replace(input, "");
        Console.WriteLine(output);
    }
}

Note that this would also remove any non-ASCII characters. An alternative regex would be:

Regex regex = new Regex(@"[^\p{Lu}]");

... I believe that should cover upper-case letters of all cultures.

Answer 2

string Code = new String(txtDesc.text.Where(c => IsUpper(c)).ToArray());