Update Data

How to correct this command of C#?

public IQuery<student> GetStudentAge(int b)
{
    return this objectContext.students.???
}

What I want is to update all StudentAge to become the value of b. My table is student with the column StudentAge...
Whing Dela CruzAsked:
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Eric FlammOwnerCommented:
Can you provide some additional context - is this in the code-behind of a page or a method in a class? Can you post the full code to enable some testing and review?
0
Whing Dela CruzAuthor Commented:
Hi! What I'm trying to do is make some adjustment of the existing code below where it is all working only in single way of action. I want to update the data of the database in 1 click where the Whole age of the student will be updated... My XAML code are as follows
 
        private void btnupdate_Click(object sender, RoutedEventArgs e)
        {
            objctx = new StudentDomainContext();
            var studentid = int.Parse(searchstudentName.Text);
            var query = objctx.GetStudentsByIdQuery(studentid);
            objctx.Load(query, EDitData, null);
        }

        private void EDitData(LoadOperation<student> lo)
        {
            student st = lo.Entities.First();
            st.StudentName = txtstudentName.Text;
            st.StudentAge = int.Parse(txtstudentage.Text);
            try
            {
                objctx.SubmitChanges();
                MessageBox.Show("Data updated successfully!");
            }
            catch (Exception ex)
            {
                MessageBox.Show("Data updation failed due to " + ex.Message);
            }
        }

And the class are as follows;

  public IQueryable<student> GetStudentsById(int id)
        {
            return this.ObjectContext.students.Where(s=> s.ID == id);
        }

the code is working... But i want to update the data base of this code. Please tell me if this is possible? Thanks!
0
nishant joshiTechnology Development ConsultantCommented:
use commit and savechanges methods.
0
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nishant joshiTechnology Development ConsultantCommented:
after that use update method of table adapter and call update method.
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Eric FlammOwnerCommented:
It seems to me that your EditData method already updates the database, changing the student name and the student age based on the values in the respective text boxes.
objctx.SubmitChanges();

Open in new window

should be sufficient to save the changes, provided your StudentDomainContext object is configured correctly.

What are you trying to accomplish that your current application doesn't do?
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Whing Dela CruzAuthor Commented:
Thanks!
0
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