How do I Eliminte multiple entries in Grid View

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C#

Windows

C#4.0

Telerik

Hello,
I am Working on Windows Form Telerik.
As I have Grid View of Telerik Control and i want to add New Entry into that.
I have Button for create new Entry Click on that button Winform will popup and on that popup if i click on save it will add that row.
But My Problem is that 1 Row added with that another Row also add which is not required.

My Code Is Below.

public void Save(TimesheetEntry timesheetEntry)
      {
          if (timesheetEntry.TimesheetEntriesId == -1)
          {
              timesheetEntry.SequenceNumber = GetNextSequenceNumber(timesheetEntry.FileId, timesheetEntry.EntryDate);
              Add(timesheetEntry);

          }
          else
          {
              Update(timesheetEntry);
          }
          //Audit trail
          //TODO:
          //MyAuditTrialModel.Add<TimesheetEntry>(Helper.Actions.CU_Timesheet, Helper.TableNames.TimesheetEntry, timesheetEntry);
      }

private TimesheetEntry Add(TimesheetEntry item)
       {
           _context.TimesheetEntries.AddObject(item);
           _context.SaveChanges();
           return item;
       }

And On Edit Button also it will Generate 2 rows.
which code is as below.

private TimesheetEntry Update(TimesheetEntry item)
       {
           _context.TimesheetEntries.ApplyChanges(item);
           _context.ObjectStateManager.ChangeObjectState(item, System.Data.EntityState.Modified);
           _context.SaveChanges(true);
           return item;
       }

plz help me to resolve this issue.

Thanks