The query results cannot be enumerated more than once, MVC WebGrid issue - asp.net-mvc

Question

Error:
System.InvalidOperationException: The query results cannot be enumerated more than once.
Code:
Controller:
namespace EmployeeAttendance_app.Controllers
{
public class HomeController : Controller
{
public ActionResult Index()
{
ViewBag.Message = "Precise Technology Consultants";
var DataContext = new EmployeeAtdDataContext();
//var EmployeeAtd = DataContext.GetAttendance_Sp();
IEnumerable<GetAttendance_SpResult> EmployeeAtd = DataContext.GetAttendance_Sp();
return View(EmployeeAtd);
}
View:
#using EmployeeAttendance_app.Models
<div>
#{
var grid = new WebGrid(Model, defaultSort: "EmplID");
}
#grid.GetHtml()
</div>
Models:
#pragma warning disable 1591
//------------------------------------------------------------------------------
// <auto-generated>
// This code was generated by a tool.
// Runtime Version:4.0.30319.237
//
// Changes to this file may cause incorrect behavior and will be lost if
// the code is regenerated.
// </auto-generated>
//------------------------------------------------------------------------------
namespace EmployeeAttendance_app.Models
{
using System.Data.Linq;
using System.Data.Linq.Mapping;
using System.Data;
using System.Collections.Generic;
using System.Reflection;
using System.Linq;
using System.Linq.Expressions;
using System.ComponentModel;
using System;
[global::System.Data.Linq.Mapping.DatabaseAttribute(Name="a1")]
public partial class EmployeeAtdDataContext : System.Data.Linq.DataContext
{
private static System.Data.Linq.Mapping.MappingSource mappingSource = new AttributeMappingSource();
#region Extensibility Method Definitions
partial void OnCreated();
#endregion
public EmployeeAtdDataContext() :
base(global::System.Configuration.ConfigurationManager.ConnectionStrings["a1ConnectionString"].ConnectionString, mappingSource)
{
OnCreated();
}
public EmployeeAtdDataContext(string connection) :
base(connection, mappingSource)
{
OnCreated();
}
public EmployeeAtdDataContext(System.Data.IDbConnection connection) :
base(connection, mappingSource)
{
OnCreated();
}
public EmployeeAtdDataContext(string connection, System.Data.Linq.Mapping.MappingSource mappingSource) :
base(connection, mappingSource)
{
OnCreated();
}
public EmployeeAtdDataContext(System.Data.IDbConnection connection, System.Data.Linq.Mapping.MappingSource mappingSource) :
base(connection, mappingSource)
{
OnCreated();
}
public System.Data.Linq.Table<EmployeeAtd> EmployeeAtds
{
get
{
return this.GetTable<EmployeeAtd>();
}
}
[global::System.Data.Linq.Mapping.FunctionAttribute(Name="dbo.GetAttendance_Sp")]
public ISingleResult<GetAttendance_SpResult> GetAttendance_Sp()
{
IExecuteResult result = this.ExecuteMethodCall(this, ((MethodInfo)(MethodInfo.GetCurrentMethod())));
return ((ISingleResult<GetAttendance_SpResult>)(result.ReturnValue));
}
}
[global::System.Data.Linq.Mapping.TableAttribute(Name="dbo.V_EmployeeAtd")]
public partial class EmployeeAtd
{
private string _EmplID;
private string _EmplName;
private string _RecDate;
private string _RecTime;
private string _DeptName;
public EmployeeAtd()
{
}
[global::System.Data.Linq.Mapping.ColumnAttribute(Storage="_EmplID", DbType="Char(8) NOT NULL", CanBeNull=false)]
public string EmplID
{
get
{
return this._EmplID;
}
set
{
if ((this._EmplID != value))
{
this._EmplID = value;
}
}
}
[global::System.Data.Linq.Mapping.ColumnAttribute(Storage="_EmplName", DbType="NVarChar(40) NOT NULL", CanBeNull=false)]
public string EmplName
{
get
{
return this._EmplName;
}
set
{
if ((this._EmplName != value))
{
this._EmplName = value;
}
}
}
[global::System.Data.Linq.Mapping.ColumnAttribute(Storage="_RecDate", DbType="Char(10)")]
public string RecDate
{
get
{
return this._RecDate;
}
set
{
if ((this._RecDate != value))
{
this._RecDate = value;
}
}
}
[global::System.Data.Linq.Mapping.ColumnAttribute(Storage="_RecTime", DbType="Char(5)")]
public string RecTime
{
get
{
return this._RecTime;
}
set
{
if ((this._RecTime != value))
{
this._RecTime = value;
}
}
}
[global::System.Data.Linq.Mapping.ColumnAttribute(Storage="_DeptName", DbType="NVarChar(50)")]
public string DeptName
{
get
{
return this._DeptName;
}
set
{
if ((this._DeptName != value))
{
this._DeptName = value;
}
}
}
}
public partial class GetAttendance_SpResult
{
private string _EmplID;
private string _EmplName;
private string _RecDate;
private string _RecTime;
private string _DeptName;
public GetAttendance_SpResult()
{
}
[global::System.Data.Linq.Mapping.ColumnAttribute(Storage="_EmplID", DbType="Char(8) NOT NULL", CanBeNull=false)]
public string EmplID
{
get
{
return this._EmplID;
}
set
{
if ((this._EmplID != value))
{
this._EmplID = value;
}
}
}
[global::System.Data.Linq.Mapping.ColumnAttribute(Storage="_EmplName", DbType="NVarChar(40) NOT NULL", CanBeNull=false)]
public string EmplName
{
get
{
return this._EmplName;
}
set
{
if ((this._EmplName != value))
{
this._EmplName = value;
}
}
}
[global::System.Data.Linq.Mapping.ColumnAttribute(Storage="_RecDate", DbType="Char(10)")]
public string RecDate
{
get
{
return this._RecDate;
}
set
{
if ((this._RecDate != value))
{
this._RecDate = value;
}
}
}
[global::System.Data.Linq.Mapping.ColumnAttribute(Storage="_RecTime", DbType="Char(5)")]
public string RecTime
{
get
{
return this._RecTime;
}
set
{
if ((this._RecTime != value))
{
this._RecTime = value;
}
}
}
[global::System.Data.Linq.Mapping.ColumnAttribute(Storage="_DeptName", DbType="NVarChar(50) NOT NULL", CanBeNull=false)]
public string DeptName
{
get
{
return this._DeptName;
}
set
{
if ((this._DeptName != value))
{
this._DeptName = value;
}
}
}
}
}
#pragma warning restore 1591
I'm newbie to MVC 3 and Linq to SQL, trying to display data in GRID using WebGrid class but getting error. I have used Linq to Sql class and dropped SP and table into it.

Answer 1

Change you View to accept list of GetAttendance_SpResult bcoz you are passing this model from your controller
#model IEnumerable<GetAttendance_SpResult>

Answer 2

Try converting ur IEnumerable to List. because When you use .ToList() on IEnumerable, all the items in the IEnumerable saved as a List. and when u work with IEnumerable item is accessed from your database
#{
var grid = new WebGrid(Model.ToList(), defaultSort: "EmplID");
}
#grid.GetHtml()