Check string is null or empty in linq

Question

I have string with empty space(\"________\")

string MyNote= Convert.ToString(Session[\"MyNote\"]);

if(MyNote!=null || MyNote != \"\")
{


}


        

Answer 1

if(MyNote!=null || MyNote.Length > 0) //or you may want to set different value than 0
{


}

Answer 2

String.IsNullOrWhiteSpace is the method you're looking for.

Indicates whether a specified string is null, empty, or consists only of white-space characters.

Alternatively, using your idea:

if(MyNote!=null && MyNote.Trim() != "")
{

}

or

if(MyNote!=null && MyNote.Trim().Length == 0)
{

}

Answer 3

This works for me:

 string MyNote = Session["MyNote"] == null ? String.Empty : Session["MyNote"].ToString();