C# Adding string to Stringcollection

Question

1.00/5 (1 vote)

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In the user Settings is set to

Name:DateEventNames
Type:StringCollection
Scope:User
Value:

This is my code

C#

Properties.Settings.Default.DatesEventNames.Add(EventTextBox.Text);

And this is my error

Object reference not set to an instance of an object

This is weird, because this code should of worked, can some one please explain why this didn't work, and tell me how to fix it?

Posted 3-Dec-12 21:54pm

C.CoderCreator

Updated 3-Dec-12 22:01pm

MT_

v2

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Comments

Simon_Whale 4-Dec-12 4:02am

your wuestion is not clear are you trying to read / write from the app.config or web.config file?

[no name] 4-Dec-12 4:17am

Im adding it the the stringcollection located in the settings

2 solutions

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MT_ · Answer 1 · 2012-12-03T22:00:00

Solution 1

You have not given much details about where this line of code is written. COnsidering it is used where EventTextBox is already initialized, only other point I can see is initialization of StringCollection

Have you done initialization something like below?

C#

StringCollection myCollection = new StringCollection();

Also, note that name of the property is different as DateEventNames at definition vs. DatesEventNames when you adding. Just check.

Hope that helps
Milind

Posted 3-Dec-12 22:00pm

MT_

Updated 3-Dec-12 22:51pm

v2

Comments

[no name] 4-Dec-12 4:15am

It is located in

private void button1_Click(object sender, RoutedEventArgs e)
{
}

And no, i don't need to initialization it because it is already setup in the settings as it says in the question

MT_ 4-Dec-12 4:52am

Also, note that name of the property is different as DateEventNames at definition vs. DatesEventNames when you adding. Just check.

Alan N 4-Dec-12 4:53am

When you get the NullReferenceException it means the object is not initialised. Don't go looking for other explanations! If you read the setting as soon as your app starts you will see that the value is null. It will be this way unless you have used the designer collection editor to add a few strings.

Simon_Whale · Answer 2 · 2012-12-03T22:38:00

Solution 2

I would start to have a read of this

C# writing to app.config file[^]

Posted 3-Dec-12 22:38pm

Simon_Whale