Is there any function in C# like isnull in SQL?

In SQL server we can use “isnull” function for example if Table1 Contains Field1 and only one record which Field1 is null we can write this Query:

select isnull(Field1,0) from Table1

which returns “0”.

can we use any function like this in C#? for Example Consider textBox1 is Empty. and I want to Show “0”.

MessageBox.show( FunctionName(textBox1.text , 0).toString());

Answer

You can create an extension method:

internal static class MyStringExtensions {

   public static string GetValueOrDefault(this string extendee, string defaultValue) {

     if(string.IsNullOrEmpty(extendee)) { return defaultValue;}
     return extendee;
   }
}

Sample Use:

MessageBox.show( textBox1.text.GetValueOrDefault("0"));