insert data into database using entity freamework in wcf ?

Hello Prasad,

please follow these code for inserting and updating you can do at a time for an example write an operation in your service interface file as UpsertStudent in this way, if it success it gives you the value as true if not false 

namespace WCFandEFService
{
[ServiceContract]
public partial interface IPrasad
{
  [OperationContract]
 bool UpsertStudent( Student student);
 
 
}


 [DataContract]
    public class Student
    {
        [DataMember]
        public int StudentID { get; set; }
        [DataMember]
        public string StudentName { get; set; }
        [DataMember]
        public string StudentField{ get; set; }
        [DataMember]
        public string StuentGrades { get; set; }
     
    }
}

Than next in your .svc file 
public partial class PrasadService: IIPrasad
{
  public bool UpsertStudent( Student student)
{
  Entities  dbcontext = new Entities  ();
  Student existingstu = dbcontext.Students.Where( dl =>dl.StudentID== student.StudentID).FirstOrDefault();
  // if the existing students count not equal to null you will update their values with new values


  if (existingstu != null)
  {
    existingstu.StudentName  = student.StudentName;
    existingstu.StudentField = student.StudentField;
    existingstu.StudentGrades = student.StudentGrades;
     
  }
  // else if existing is null you will insert the new student into database
 
  else
   {
     Student s = new Student
      {
          StudentID = student.StudentID ,
          StudentName  = student.StudentName ,
          StudentField= student.StudentField,
          StudentGrades = student.StudentGrades
           
      };
       
     dbcontext.Students.Add(s)    
   }
 // try to make changes to the database if everything goes well it returns the value as true
   try
       {
         
        dbcontext.SaveChanges();  
        return true;
       }


     catch
{
return false;
}
 
}