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How to check whether a string variable is empty or null in C#?

To check if a string is null or empty in C# you can use method string.IsNullOrEmpty().

Example

using System;

public class Example
{
    public static void Main()
    {
	string strNotEmptyExample = "hello";
	if (string.IsNullOrEmpty(strNotEmptyExample)) {
		Console.WriteLine("strNotEmptyExample is empty");
	}else{
		Console.WriteLine("strNotEmptyExample is not empty");
	}
		
	string strEmptyExample = "";
	if (string.IsNullOrEmpty(strEmptyExample)) {
		Console.WriteLine("strEmptyExample is empty");
	}
    }
}

Output

strNotEmptyExample is not empty
strEmptyExample is empty

Conclusion

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