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MVC CRUD using AJAX passing model data for POST-PUT-GET-Delete using Entity Framework

//------------------------------------------------------------------------------
// <auto-generated>
//     This code was generated from a template.
//
//     Manual changes to this file may cause unexpected behavior in your application.
//     Manual changes to this file will be overwritten if the code is regenerated.
// </auto-generated>
//


------------------------------------------------------------------------------

namespace UserManagementWebApp.DataAccess
{
    using System;
    using System.Collections.Generic;
   
    public partial class Customer
    {
        public int CustId { get; set; }
        public string Name { get; set; }
        public string Address { get; set; }
        public string City { get; set; }
        public string State { get; set; }
        public string Country { get; set; }
        public Nullable<long> Contact { get; set; }
        public string Email { get; set; }
    }
}

--------------------------------------------------------------------------------
@model UserManagementWebApp.DataAccess.Customer

@{
    Layout = null;
}

<!DOCTYPE html>

<script src="~/Scripts/jquery-1.10.2.min.js"></script>

<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>AddCustomer</title>
</head>
<body>
    @using (Html.BeginForm())
    {
        @Html.AntiForgeryToken()
       
    <div class="form-horizontal">
        <h4>Customer</h4>
        <hr />
        @Html.ValidationSummary(true, "", new { @class = "text-danger" })
        <div class="form-group">
            @Html.LabelFor(model => model.CustId, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.CustId, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.CustId, "", new { @class = "text-danger" })
                            <input type="button" id="btnSearch" value="Search" onclick="SearchCustomer()" />
            </div>
        </div>
        <div class="form-group">
            @Html.LabelFor(model => model.Name, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.Name, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.Name, "", new { @class = "text-danger" })
            </div>
        </div>
        <div class="form-group">
            @Html.LabelFor(model => model.Address, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.Address, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.Address, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.City, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.City, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.City, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.State, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.State, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.State, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.Country, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.Country, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.Country, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.Contact, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.Contact, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.Contact, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.Email, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.Email, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.Email, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            <div class="col-md-offset-2 col-md-10">
                <input type="button" value="Create" onclick="SaveCustomer()" class="btn btn-default" />
                <input type="button" value="Update" onclick="UpdateCustomer()" class="btn btn-default" />
                <input type="button" value="Delete" onclick="DeleteCustomer()" class="btn btn-default" />
                <input type="button" value="Reset" onclick="ResetCustomer()" class="btn btn-default" />
            </div>
        </div>
    </div>
    }
   
    <div>
        @Html.ActionLink("Back to List", "Index")
    </div>
</body>
</html>
<script>
    function SaveCustomer() {
        debugger;
        var customer = new Object;
        customer.Name = $('#Name').val();
        customer.Address = $('#Address').val();
        customer.City = $('#City').val();
        customer.State = $('#State').val();
        customer.Country = $('#Country').val();
        customer.Contact = $('#Contact').val();
        customer.Email = $('#Email').val();

        $.ajax({
            url: 'ManageCustomer/AddCustomer',
            type: 'Post',
            data: customer,
            dataType: 'json',
            ContentType: 'application/json',
            success: function (data) {
                if (data != null) {
                    alert('Data saved successfully');
                }
            }
        })
    }
    function SearchCustomer() {
        let custId = $('#CustId').val();
        $.ajax({
            url:'ManageCustomer/GetCustomerById',
            type: 'Get',
            data: {custId: custId},
            dataType: 'json',
            success: function (result) {
                if (result != null) {
                    BindCustomerData(result)
                }
            }
        })
    }
    function BindCustomerData(result) {
        $('#Name').val(result.Name);
        $('#Address').val(result.Address);
        $('#City').val(result.City);
        $('#State').val(result.State);
        $('#Country').val(result.Country);
        $('#Contact').val(result.Contact);
        $('#Email').val(result.Email);
    }
    function UpdateCustomer() {
        debugger;
        var customer = new Object;
        customer.CustId = $('#CustId').val();
        customer.Name = $('#Name').val();
        customer.Address = $('#Address').val();
        customer.City = $('#City').val();
        customer.State = $('#State').val();
        customer.Country = $('#Country').val();
        customer.Contact = $('#Contact').val();
        customer.Email = $('#Email').val();

        $.ajax({
            url: 'ManageCustomer/UpdateCustomer?id=' + $('#CustId').val(),
            type: 'Put',
            data: customer,
            dataType: 'json',
            ContentType: 'application/json',
            success: function (data) {
                debugger;
                if (data != null) {
                    alert('Data Updated successfully');
                }
            }
        })
    }
    function DeleteCustomer() {
        let custId = $('#CustId').val();
        $.ajax({
            url: 'ManageCustomer/DeleteCustomer?custId=' + $('#CustId').val(),
            type: 'Delete',
            dataType: 'json',
            success: function (result) {
                if (result != null) {
                    alert('Data deleted successfully');
                    ResetCustomer();
                }
            }
        })
    }
    function ResetCustomer() {
        $('#CustId').val('');
        $('#Name').val('');
        $('#Address').val('');
        $('#City').val('');
        $('#State').val('');
        $('#Country').val('');
        $('#Contact').val('');
        $('#Email').val('');
    }
</script>

-----------------------------------------------------------------------------------------------

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using UserManagementWebApp.DataAccess;

namespace UserManagementWebApp.Controllers
{
    public class ManageCustomerController : Controller
    {
        UserManagementEntities _dbEntity = new UserManagementEntities();

        // GET: ManageCustomer
        public ActionResult AddCustomer()
        {
            return View();
        }

        [HttpPost]
        public JsonResult AddCustomer(Customer customer)
        {
            _dbEntity.Customers.Add(customer);
            _dbEntity.SaveChanges();
            return Json(customer, JsonRequestBehavior.AllowGet);
        }

        [HttpGet]
        public JsonResult GetCustomerById(int? custId)
        {
            return Json(_dbEntity.Customers.FirstOrDefault(t => t.CustId == custId), JsonRequestBehavior.AllowGet);
        }

        [HttpPut]
        public JsonResult UpdateCustomer(int? id, Customer customer)
        {
            _dbEntity.Customers.Add(customer);
            _dbEntity.Entry(customer).State = System.Data.Entity.EntityState.Modified; // entity is modified
            _dbEntity.SaveChanges();
            return Json(customer, JsonRequestBehavior.AllowGet);
        }
           
        [HttpDelete]
        public JsonResult DeleteCustomer(int? custId)
        {
            Customer cust = _dbEntity.Customers.FirstOrDefault(t => t.CustId == (int)custId);
            _dbEntity.Customers.Remove(cust);
            _dbEntity.SaveChanges();
            return Json(custId, JsonRequestBehavior.AllowGet);
        }
    }
}
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