How to checking the NLL value for the integer in ASP.Net c#

Step 1:- First write code in the button click like this

int value = null;

it will show error because normally not possible to assign null value to the int

Step 2:- By using “?” we can able to assign the null values to the integer like

int? value = null;

for checking this process using the brake point the code and checking one by one code line

if (value.HasValue == true)

{

    Console.WriteLine("True");

}

 Step 3:-

When  value.HasValue calls it will default false

Then we assign value to the integer

int? value = 1;

then automatically value.HasValue returns “True”

Full Code:-

int? value = null;

Console.WriteLine(value.HasValue);

Output: FALSE

Value=1;

Console.WriteLine(value.HasValue);

Output: TRUE

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