Reading User Setting value from setting file c# console application

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Null reference error occurs on reading value from setting file.

C#

<setting name="Last_Selected_Vodafone" serializeas="String">
              <value />
          </setting>

i have this property in setting file . when i try to access this in c#

C#

Properties.Settings.Default.Last_Selected_Vodafone;

i am getting null reference error.. that could be because default value is null and its a datetime property......

how can i set

C#

datetime variable = datetime.now ?

any idea

Posted 9-Mar-14 21:06pm

Raman Midha

Updated 9-Mar-14 21:17pm

Sampath Lokuge

v2

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JoCodes 10-Mar-14 3:27am

What you mean by setting file here?

Raman Midha 10-Mar-14 3:48am

joCodes setting file here means?

1 solution

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Sampath Lokuge · Answer 1 · 2014-03-09T21:21:00

Solution 1

Please try is as below.

NOTE: Please do necessary casting if it requires.

SQL

DateTime variable = Properties.Settings.Default.Last_Selected_Vodafone ?? DateTime.Now;

?? Operator

LIVE DEMO : .NET FIDDLE

Posted 9-Mar-14 21:21pm

Sampath Lokuge

Updated 9-Mar-14 21:45pm

v5

Comments

Raman Midha 10-Mar-14 3:26am

Sorry Sampath, we can not use ?? with datetime . we will have to make nullable type .

i tried to use ?? with datetime in this way

DateTime ? LastSelect=Properties.Settings.Default.Last_Selected_Vodafone;

i am getting Object reference not set to an instance of an object ( NUll reference error)

Sampath Lokuge 10-Mar-14 3:36am

You're wrong.Please check my LIVE DEMO.You can use ?? with DateTime.

Raman Midha 10-Mar-14 3:39am

how can we set null value in not nullable types do you think its possible

Sampath Lokuge 10-Mar-14 3:42am

You're not setting null for the 'variable' know ? If your 'Last_Selected_Vodafone' is null then you set the DateTime.Now for the 'variable'.Which is not null DateTime Variable.Am I right ?Please check and play with the LIVE DEMO.

Raman Midha 10-Mar-14 3:47am

yes you are right ..but the thing is as i try to access Properties.Settings.Default.Last_Selected_Vodafone;

i get object refernce error .. it means property does not return null value.. its throwing an exception .. so we can not check its null value like this..

i added solution below....