Thread: Null Value in C#

I am learning C# programming language. I write a small program in which I have to check the null value. I have tried lot of code bit none of them worked out. So I want to know how to Check Null Value in C#..?? any help would be highly appreciated. Thanks in advanced.

Try out this code, when you run this program you Check Null Value as an output result:

Code:

if(dr["AdmissionDate"] == DBNull.Value)
{
//Null value in AdmissionDate Column
}
else
{	
//Not Null
}

Follow the steps for checking the null values in C#:

1. Create the variable first. A variable should be declared before using it. You can use the following code for creating the variable :

Code:

string myNullVar = null;

2. After that you will have to make sure that whether the variable is null or not. You can use the following code for that purpose :

Code:

if(myNullVar == null) {
myNullVar = "RED";
}

3. Then you will have to check if the variable is not null. In a few cases, you may want to relocate the variable back to null. The following code is useful for that :

Code:

if(myNullVar != null) {
myNullVar = null;
}