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I would like to check a variable as assigned or not. How can we do that?

Posted By :nishithraj     Posted Date :March 15, 2010    Points :10   Category :.NET Framework 
Declare the variable as Nullable

You can also find related Interview Question to I would like to check a variable as assigned or not. How can we do that?  below: 

How do you check if a variable is an array in JavaScript

  
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How can we check that some changes have been made to dataset since it was loaded?

  


The changes made to the dataset can be tracked using the GetChanges and HasChanges methods.
GetChanges():
-------------
The GetChanges returns dataset which are changed since it was loaded or since Acceptchanges was executed.

HasChanges():
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The HasChanges property indicates if any changes were made to the dataset since it was loaded or if acceptchanges method was executed.

RejectChanges():
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The RejectChanges can be used to revert thee changes made to the dataset since it was loaded

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What is Check Constraint?

  
Check constraint specifies a condition that is enforced for each row of the table on which the constraint is defined. Once constraint is defined, insert or update to the data within the tables is checked against the defined constraint
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I was trying to use an "out int" parameter in one of my functions. How should I declare the variable that I am passing to it?

  
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