null value in function in C#

In C#, you can handle null values in functions in several ways. The below are some ways.

  • Null Check with Conditional Statements:

    Before using it in your function, Use an if statement to check if a parameter is null.

    using System;
    public class CSharpTutorial
    {
    public static void Main(string[] args)
    {
    if (parameter != null)
    {

    // Your code here

    }
    else
    {

    // Handle null case

    }
    }
    }
    }
  • Null Coalescing Operator (??):

    This operator provides a concise way to handle null values by providing a default value if the expression is null.

    using System;
    public class CSharpTutorial
    {
    public static void Main(string[] args)
    {
    string value = parameter ?? "Default";

    // Your code here

    }
    }
    }
  • Null-Conditional Operator (?.):

    This operator allows you to access members of an object if the object is not null, reducing the need for explicit null checks.

    using System;
    public class CSharpTutorial
    {
    public static void Main(string[] args)
    {
    int? result = obj?.SomeProperty;
    }
    }
    }
  • Default Parameter Values:

    You can set default parameter values, which will be used if the caller does not provide a value (or provides null).

    using System;
    public class CSharpTutorial
    {
    public static void Main(string[] args)
    {

    // Your code here

    }
    }
  • null Parameter Values:

    You can set null parameter values, which will be used if the caller does not provide a value (or provides null).

    using System;
    public class CSharpTutorial
    {
    public static void Main(string[] args)
    {

    // Your code here

    }
    }
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