removechar.cs

public 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 == '-' || c == '.' || c==' ')
		{
			sb.Append(c);
		}
	}

	return sb.ToString();
}