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

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?

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Answers:

Method 1

Method 2

Answers:

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Method 1

You need to initialize the list first:

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

Method 2

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.

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

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