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 B

Answer 1

Without Regex:

string input = "Blue Cross Blue Shield";
string output = new string(input.Where(Char.IsUpper).ToArray());
Response.Write(output);