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► KB ► To/From Guides ► C# ► Language Basics

Empty String Check (Cross Ref > Language Basics)

By Mike Prestwood

C# versus JavaScript: A side by side comparison between C# and JavaScript.

Operators

A language symbol used for assignment, comparison, computational, or as a logical.

Empty String Check

[Other Languages]

Languages Focus

An empty string is a zero length string, a string that is equal to null (""), or not assigned. In some languages, you can check if a string is empty by comparing it to an empty string (""). Some languages distinguish between nil and null ("") so checking if the length is 0 is easier.

C#: String.IsNullOrEmpty

The .Net framework offers a static method in the string class: String.IsNullOrEmpty.

Syntax Example:

String s;

s = "";
//s = null;  //Uncomment to test 2nd case.

if (String.IsNullOrEmpty(s))
{
  MessageBox.Show("empty string");
}

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