How to solve Object reference not set to an instance of an object.?

C#asp.netNullreferenceexception

C# Problem Overview

In my asp.net program.I set one protected list.And i add a value in list.But it shows Object reference not set to an instance of an object error

protected List<string> list;
protected void Page_Load(object sender, EventArgs e)
{
     list.Add("hai");
}

How to solve this error?

C# Solutions

Solution 1 - C#

You need to initialize the list first:

protected List<string> list = new List<string>();

Solution 2 - C#

I think you just need;

List<string> list = new List<string>();
list.Add("hai");

There is a difference between

List<string> list;

and

List<string> list = new List<string>();

When you didn't use new keyword in this case, your list didn't initialized. And when you try to add it hai, obviously you get an error.

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Content TypeOriginal AuthorOriginal Content on Stackoverflow
Questionr.vengadeshView Question on Stackoverflow
Solution 1 - C#TinsaView Answer on Stackoverflow
Solution 2 - C#Soner GönülView Answer on Stackoverflow