How to perform update and delete using ado.net entity data model

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Hai friends,
I am using ado.net entity data model for insert,update and delete in wcf services . but i am unable to perform update operation . I have posted my code below so kindly give ur solns

Iwardservice.cs:

C#

[ServiceContract]
    public interface IWardService
    {

C#

[OperationContract]
       bool UpdateWard(WardMaster ward);

}

Wardservice.svc.cs:

C#

public bool UpdateWard(WardMaster ward)
       {
           WardConfig context = new WardConfig();

           var wardToUpdate = context.Gema_WardSecond.First(p => p.Wardid == ward.Wardid);
           if (wardToUpdate == null) return false;
           wardToUpdate.CompanyCode = ward.CompanyCode;
           wardToUpdate.Yearcode = ward.Yearcode;
           wardToUpdate.Wardid = ward.Wardid;
           wardToUpdate.WardName = ward.WardName;
           wardToUpdate.Remarks = ward.Remarks;
           wardToUpdate.ActiveFlag = Convert.ToByte(ward.ActiveFlag);
           wardToUpdate.CreatedBy = ward.CreatedBy;
           wardToUpdate.Createddate = ward.Createddate;
           wardToUpdate.ModifiedDate = ward.ModifiedDate;
           context.SaveChanges();
           return true;



       }

Posted 29-Sep-13 23:17pm

MurugappanCTS

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Er Daljeet Singh 30-Sep-13 5:46am

Dear you should whether your "context.SaveChanges();" is called on not.

1 solution

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G3Coder · Accepted Answer · 2013-09-30T03:25:00

Hi,

Maybe you should try FirstOrDefault() when you are retrieving the wardToUpdate. If First() doesn't find anything it will throw an exception and depending on your WCF setup you might be losing that. And then like Er Daljeet Singh pointed out you are always returning true. I would also expect the modified date to change to reflect these changes.

Good luck.

C#

public bool UpdateWard(WardMaster ward)
       {
           WardConfig context = new WardConfig();

           var wardToUpdate = context.Gema_WardSecond.Where(p => p.Wardid == 
             ward.Wardid).FirstOrDefault();
           if (wardToUpdate == null) return false;
           wardToUpdate.CompanyCode = ward.CompanyCode;
           wardToUpdate.Yearcode = ward.Yearcode;
           wardToUpdate.Wardid = ward.Wardid;
           wardToUpdate.WardName = ward.WardName;
           wardToUpdate.Remarks = ward.Remarks;
           wardToUpdate.ActiveFlag = Convert.ToByte(ward.ActiveFlag);
           wardToUpdate.CreatedBy = ward.CreatedBy;
           wardToUpdate.Createddate = ward.Createddate;
           wardToUpdate.ModifiedDate = ward.ModifiedDate;
           var numberOfChanges = context.SaveChanges();
           return (numberOfChanges > 0);
       }