Truncate a string too long for display. So, "A too long string" become "A too long s..." if limit is 12 chars.

StringTruncate.cs

public static string Truncate(this string myString, int limit, string symbol)
{
    if (myString == null)
        return null;
 
    if (limit < 0)
        throw new ArgumentOutOfRangeException("limit", limit, "must be 0 or greater");
 
    if (symbol == null)
        throw new ArgumentNullException("symbol must not be null");
 
    if (myString.Length < limit)
        return myString;
 
    return myString.Substring(0, limit) + symbol;
}