Delete All

How to delete all data in sql in one click?
This is most likely related with my pending question which is now still searching for the solution. The XAML.cs here are as follows

StudentDomainContext objctx;

private void btndelete_Click(object sender, RoutedEventArgs e)
{
objctx = new StudentDomainContext();
var query = objctx.GetStudentsQuery();
objctx.Load(query, Datadelete, null);
}

private void Datadelete(LoadOperation<student> lo)
{
student st = lo.Entities.First();
objctx.student.Remove(st);
try
{
objctx.SubmitChanges();
MessageBox.Show("Data deleted!")
}
catch (Exception ex)
{
MessageBox.Show("Data deletion failed" +ex.Message);
}

}

The Class query are as follos......
public IQueryable<student> GetStudents()
{
return this.ObjectContext.students;
}

The codes are working but when I execute, only one data will be deleted. What I want here is to delete all datas inside my database concerning student Table. Please Help!
Whing Dela CruzAsked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

x
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

angus_young_acdcCommented:
It is because you are only selecting the first value on this line: student st = lo.Entities.First();

Try changing it to lo.Entities.All();
0
angus_young_acdcCommented:
Or change the query to DELETE FROM [YourStudentTableName]

If there is no Where clause then it will delete everything in that table.
0
Whing Dela CruzAuthor Commented:
Hi! I tried this lo.Entities.All(); but it doesn't work! Can you provide me how to change the query?
0
Become a CompTIA Certified Healthcare IT Tech

This course will help prep you to earn the CompTIA Healthcare IT Technician certification showing that you have the knowledge and skills needed to succeed in installing, managing, and troubleshooting IT systems in medical and clinical settings.

angus_young_acdcCommented:
var query = objctx.GetStudentsQuery();


The above line should be returning your query (from what I can work out from the amount of code), within the GetStudentsQuery method you should see what is happening and be able to update it accordingly.
0
Whing Dela CruzAuthor Commented:
Hi! I'm trying but it does'nt work...
0
Whing Dela CruzAuthor Commented:
Hi! Everyone, What I did here is to put something Loop... But I dought if it is good I dea because I feel that there's something delay of the Looping. Any Idea Please....

private void Datadelete(LoadOperation<student> lo)
{
foreach (student st in lo.Entities)
objctx.student.Remove(st);
try
{
objctx.SubmitChanges();
MessageBox.Show("Data deleted!")
}
catch (Exception ex)
{
MessageBox.Show("Data deletion failed" +ex.Message);
}

}

 Please tell me if there is another solution aside from this....
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
Whing Dela CruzAuthor Commented:
Thanks!
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
C#

From novice to tech pro — start learning today.