c# string remove special characters
public static string RemoveSpecialCharacters(this 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(); }