Check Whether an Input Argument Is Null in C#

Use this extension method in C# to check whether or not an input argument is null, and throw an error if necessary.

Extension method:

public static void CheckIfParameterIsValid(this T o, string parameter) where T : class{        if (o == null) {throw new ArgumentNullException (parameter + " is null, please provide a valid value.");}}//Usagestring firstName = null;firstName. CheckIfParameterIsValid ("firstName "); 

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