Is there any different between stringvariable != NullValue.String and !string.IsNullOrEmpty(stringvariable) in asp.net ? then which is best ?
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2 Answers
The first tests that the string isn't "".
As strings can be null (because they are actually references) this test could fail.
By using IsNullOrEmpty you are wrapping:
if (string != null && string.Length > 0)
in one test.
Comments
IsNullOrEmpty is implemented like:
public static bool IsNullOrEmpty(string value)
{
if (value != null)
{
return (value.Length == 0);
}
return true;
}
So it checks both an empty string, and a null string. (Where is NullValue.String defined, I cannot seem to find a reference to it in any docs, but I assume it's eiter String.Empty or "null", so your first check only checks for one of these conditions.)
.Net4 has a new function called IsNullOrWhiteSpace(string value) which also returns true if the string contains only white space.
