How to resolve this Error: Object reference not set to an instance of an object.

Question

1.00/5 (2 votes)

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string s=ListBox1.SelectedItem.Value.ToString();
Error:

Object reference not set to an instance of an object.

Posted 17-Jul-15 3:56am

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[no name] 17-Jul-15 10:07am

Think about that it can be, that there is no item selected...

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phil.o · Answer 1 · 2015-07-17T04:10:00

Maybe:

if (ListBox1.SelectedItem != null) {
   string s = ListBox1.SelectedItem.Value.ToString();
}

You should learn how to debug your project; that would have allowed you to point out and solve the problem in no time.

Posted 17-Jul-15 4:10am

Comments

Member 11804811 17-Jul-15 10:18am

I selected a item and rather it show this Exception And Know the Debugging also.

Member 11804811 17-Jul-15 10:19am

When i Debug It show this Error

phil.o 17-Jul-15 10:25am

Then maybe try to use SelectedValue instead of SelectedItem. What are the values of each of these properties while you debug?

Member 11804811 17-Jul-15 10:46am

Okk....Let me check..