remove illegal character from a string

Using regular expressions with C#:

using System.Text.RegularExpressions;  string your_String = "Hello@Hello&Hello(Hello)"; string my_String = Regex.Replace(your_String, @"[^0-9a-zA-Z]+", ",");

public static string RemoveSpecialCharacters(string str) 

{

 StringBuilder sb = new StringBuilder(); 

foreach (char c in str) 

{ if ((c >= '0' && c <= '9') || (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') || c == '.' || c == '_') 

{       

   sb.Append(c); 

} 

}

 return sb.ToString(); 

}

You can also find long discussion here.

http://forums.asp.net/t/61673.aspx?Remove+characters+from+a+string+to+be+used+as+a+file+name