How do you check a string for null? Well, there is very little difference between these coding methods.

if (testString == null)

if (testString is null)

if (string.IsNullOrEmpty(testString))

Just remember that IsNullOrEmpty() also checks for an empty string, so my recommendation is to utilize it.

Benchmark Results

Below are the benchmark results for these null checks. All methods allocate zero bytes in memory.

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Code It Any Way You Want: Checking Strings for Null