C# 2010 working with strings

Question

In a C#.net 2010 application I need to only select alphabetic characters (A to Z) from a large textbox where users can enter anything. These alphabetic characters can be in upper or lower case. I need to concantenate the results together. No other characters are suppose to be selected. Thus can you tell me how to accomplish this task?

Vulpes · Answer

The basic code needed to do that would be as follows: var sb = new System.Text.StringBuilder(); foreach(char c in textBox1.Text) { if ((c >= 'a' && c = 'A' && c } string result = sb.ToString(); MessageBox.Show(result);