ToString

 /// <summary>
        /// Returns a formatted double or emtpy string
        /// </summary>
        /// <param name="t">double or null</param>
        /// <param name="format">double formatstring </param>
        /// <returns></returns>
        public static string ToString(this double? t, string format) 
        {
            if (t != null)
            {
                return t.Value.ToString(format);
            }

            return "";
        }
Example:
double? pi = null;

string s = pi.ToString("0.00"); //s = ""
pi = Math.Pi;

s = pi.ToString("0.00");  //s = 3.14

Description

Returns a formatted string on a nullable double

Details

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