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asp.net master property string, how to check in content page if string is empty
public String SharedInfo
{
    get { return (String)Session["SharedInfo"]; }
    set { Session["SharedInfo"] = value; }
}

if (String.IsNullOrEmpty(Master.SharedInfo)) {
    ...
}

string s = null;
int i = s.Length; // <-- Throws null reference exception

string s = "";
int i = s.Length; // OK, i => 0

string s = "";
Console.WriteLine(Object.ReferenceEquals(s, "")); // --> true
Console.WriteLine(Object.ReferenceEquals(s, String.Empty)); // --> true

if (String.IsNullOrWhitespace(Master.SharedInfo)) {
    ...
}