An exception of type 'System.NotSupportedException' occurred

Question

#controller

public ActionResult Employee(int txtEmployeeId, string txtEmployeeName, string txtEmployeeDesignation, HttpPostedFileBase Empimage, double txtSalary, string txtEmployeeDpt, byte[] bytes)
{
EmployeeBusiness EmpBusiness = new EmployeeBusiness();
EmployeeEntity emp = new EmployeeEntity();
emp.Empid = Convert.ToInt32(txtEmployeeId);
emp.Empname = txtEmployeeName;
emp.Designation = txtEmployeeDesignation;
emp.Salary = Convert.ToDouble(txtSalary);
emp.Department = txtEmployeeDpt;
emp.Empimage = savetophysicallocation(Empimage);
EmpBusiness.saveEmployeeDetails(emp);
return View();
}
private string savetophysicallocation(HttpPostedFileBase Empimage)
{
if(Empimage.ContentLength>0){
var fileName=Path.GetFileName(Empimage.FileName);
var upload="~/C:/Users/sangeetha.k/Desktop/images";
var path = Path.Combine(Server.MapPath(upload), fileName);
Empimage.SaveAs(path);
return path;
}
return string.Empty;
}
}
}

#Business Layer

namespace EmployeeBusinessLayer
{
public class EmployeeBusiness
{
EmployeeDataAcess empdata = new EmployeeDataAcess();
public void saveEmployeeDetails(EmployeeEntity emp)
{
empdata.saveEmployeeDetails(emp);
}
}
}

#Data AccessLayer

public class EmployeeDataAcess
{
string ConnectionString = ConfigurationManager.ConnectionStrings["Employee"].ConnectionString;
AdventureWorksEntities EmpDbEntity = new AdventureWorksEntities();
tblEmployee EmployeeDbContext = new tblEmployee();
public void saveEmployeeDetails(EmployeeEntity emp)
{
using (AdventureWorksEntities EmpDbEntity = new AdventureWorksEntities())
{
tblEmployee EmployeeDbContext = null;
if(EmpDbEntity.tblEmployees==null)
{
EmployeeDbContext.Empid = emp.Empid;
EmployeeDbContext.Empname = emp.Empname;
EmployeeDbContext.Designation = emp.Designation;
EmployeeDbContext.Empimage = emp.Empimage;
EmployeeDbContext.Empimage = emp.Empimage;
EmployeeDbContext.Salary = emp.Salary;
EmployeeDbContext.Email = emp.Email;
EmployeeDbContext.Department = emp.Department;
}
if(EmpDbEntity.tblEmployees!=null)
{
EmployeeDbContext = EmpDbEntity.tblEmployees.Where(x => x.Empid == emp.Empid).FirstOrDefault();
}
}
}
}
}

and #entity Layer

public class EmployeeEntity
{
public int Empid { get; set; }
public string Empname { get; set; }
public string Designation { get; set; }
public string Empimage { get; set; }
public byte[] ImageData { get; set; }
public Nullable<double> Salary { get; set; }
public string Email { get; set; }
public string Department { get; set; }
//public EmployeeEntity()
//{
//}
//public EmployeeEntity(int Empid, string Empname, string Designation, string Empimage, byte[] ImageData, double Salary, string Email, string Department)
//{
// this.Empid = Empid;
// this.Empname = Empname;
// this.Designation = Designation;
// this.Empimage = Empimage;
// this.ImageData = ImageData;
// this.Salary = Salary;
// this.Email = Email;
// this.Department = Department;
}
}

#sql Table structure

 

Empid int

Empname nvarchar

Designation nvarchar

Empimage nvarchar

ImageData varbinary

Salary float

Email nvarchar

Department nvarchar