<div>
    <!-- upload form -->
    <!-- hidden crop params -->
    <input type="hidden" id="x1" name="x1" />
    <input type="hidden" id="y1" name="y1" />
    <input type="hidden" id="x2" name="x2" />
    <input type="hidden" id="y2" name="y2" />
    <h2>ابتدا تصویر خود را انتخاب کنید</h2>
    <div><input type="file" name="postedFileBase" data-buttonText="انتخاب تصویر" id="image_file" onchange="fileSelectHandler()" /></div>
    <div></div>
    <div>
        <h2>قسمتی از تصویر را انتخاب نمایید</h2>
        <img id="preview" />
        <div>
            <label>حجم فایل </label> <input type="text" id="filesize" name="filesize" />
            <label>نوع فایل</label> <input type="text" id="filetype" name="filetype" />
            <label>ابعاد فایل</label> <input style="direction: ltr;" type="text" id="filedim" name="filedim" />

        </div>
    </div>

</div>

.bheader {
background-color: #DDDDDD;
border-radius: 10px 10px 0 0;
padding: 10px 0;
text-align: center;
}
.bbody {
color: #000;
overflow: hidden;
padding-bottom: 20px;
text-align: center;
background: -moz-linear-gradient(#ffffff, #f2f2f2);
background: -ms-linear-gradient(#ffffff, #f2f2f2);
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #ffffff), color-stop(100%, #f2f2f2));
background: -webkit-linear-gradient(#ffffff, #f2f2f2);
background: -o-linear-gradient(#ffffff, #f2f2f2);
filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#ffffff', endColorstr='#f2f2f2');
-ms-filter: "progid:DXImageTransform.Microsoft.gradient(startColorstr='#ffffff', endColorstr='#f2f2f2')";
background: linear-gradient(#ffffff, #f2f2f2);
}
.bbody h2, .info, .error {
margin: 10px 0;
}
.step2, .error {
display: none;
}
.error {
color: red;
}
.info {
}
label {
margin: 0 5px;
}
.roundinput {
border: 1px solid #CCCCCC;
border-radius: 10px;
padding: 4px 8px;
text-align: center;
width: 150px;
}
.jcrop-holder {
display: inline-block;
}
input[type=submit] {
background: #e3e3e3;
border: 1px solid #bbb;
border-radius: 3px;
-webkit-box-shadow: inset 0 0 1px 1px #f6f6f6;
box-shadow: inset 0 0 1px 1px #f6f6f6;
color: #333;
padding: 8px 0 9px;
text-align: center;
text-shadow: 0 1px 0 #fff;
width: 150px;
}
input[type=submit]:hover {
background: #d9d9d9;
-webkit-box-shadow: inset 0 0 1px 1px #eaeaea;
box-shadow: inset 0 0 1px 1px #eaeaea;
color: #222;
cursor: pointer;
}
input[type=submit]:active {
background: #d0d0d0;
-webkit-box-shadow: inset 0 0 1px 1px #e3e3e3;
box-shadow: inset 0 0 1px 1px #e3e3e3;
color: #000;
}

function bytesToSize(bytes) {
    var sizes = ['بایت', 'کیلو بایت', 'مگابایت'];
    if (bytes == 0) return 'n/a';
    var i = parseInt(Math.floor(Math.log(bytes) / Math.log(1024)));
    return (bytes / Math.pow(1024, i)).toFixed(1) + ' ' + sizes[i];
};

function updateInfo(e) {
    $('#x1').val(e.x);
    $('#y1').val(e.y);
    $('#x2').val(e.x2);
    $('#y2').val(e.y2);
};

var jcrop_api, boundx, boundy;
function fileSelectHandler() {

    var oFile = $('#image_file')[0].files[0];

    $('.error').hide();
    var rFilter = /^(image\/jpeg|image\/png)$/i;
    if (!rFilter.test(oFile.type)) {
        $('.error').html('فقط تصویر معتبر انتخاب نمایید').show();
        return;
    }

   
    var oImage = document.getElementById('preview');

    var oReader = new FileReader();
    oReader.onload = function (e) {

        oImage.src = e.target.result;
        

        oImage.onload = function () { 
          

            $('.step2').fadeIn(500);

            var sResultFileSize = bytesToSize(oFile.size);
            $('#filesize').val(sResultFileSize);
            $('#filetype').val(oFile.type);
            $('#filedim').val(oImage.naturalWidth + ' x ' + oImage.naturalHeight);
     
            if (typeof jcrop_api != 'undefined') {
                jcrop_api.destroy();
                jcrop_api = null;
                $('#preview').width(oImage.naturalWidth);
                $('#preview').height(oImage.naturalHeight);
            }
  
                $('#preview').Jcrop({

                    aspectRatio: 2,
                    bgFade: true,
                    bgOpacity: .3, 
                    onChange: updateInfo,
                    onSelect: updateInfo
                }, function () {
 
                    //var bounds = this.getBounds();
                    //var boundx = bounds[0];
                    //var boundy = bounds[1];

                    // Store the Jcrop API in the jcrop_api variable
                    jcrop_api = this;
                });
        };
    };
    oReader.readAsDataURL(oFile);
}

function fileSelectHandler() {
    var oFile = $('#image_file')[0].files[0];
    $('.error').hide();
    var rFilter = /^(image\/jpeg|image\/png)$/i;
    if (!rFilter.test(oFile.type)) {
        $('.error').html('فقط تصویر معتبر انتخاب نمایید').show();
        return;
    }

   var oImage = document.getElementById('preview');
    var oReader = new FileReader();
    oReader.onload = function (e) {

        oImage.src = e.target.result;
        oImage.onload = function () {
       
            $('.step2').fadeIn(500);

            var sResultFileSize = bytesToSize(oFile.size);
            $('#filesize').val(sResultFileSize);
            $('#filetype').val(oFile.type);
            $('#filedim').val(oImage.naturalWidth + ' x ' + oImage.naturalHeight);
   
            if (typeof jcrop_api != 'undefined') {
                jcrop_api.destroy();
                jcrop_api = null;
                $('#preview').width(oImage.naturalWidth);
                $('#preview').height(oImage.naturalHeight);
            }
            $('#preview').Jcrop({

                aspectRatio: 2,
                bgFade: true, 
                bgOpacity: .3, 
                onChange: updateInfo,
                onSelect: updateInfo,
                onRelease: clearInfo
            }, function () {

                //var bounds = this.getBounds();
                //var boundx = bounds[0];
                //var boundy = bounds[1];

                jcrop_api = this;
            });
        };
    };
    oReader.readAsDataURL(oFile);

minSize:[40,20]

aspectRatio:1.5

function updateInfo(e) {
    $('#x1').val(e.x);
    $('#y1').val(e.y);
    $('#x2').val(e.x2);
    $('#y2').val(e.y2);
};

function bytesToSize(bytes) {
    var sizes = ['بایت', 'کیلو بایت', 'مگابایت'];
    if (bytes == 0) return 'n/a';
    var i = parseInt(Math.floor(Math.log(bytes) / Math.log(1024)));
    return (bytes / Math.pow(1024, i)).toFixed(1) + ' ' + sizes[i];
};

public static byte[] Resize(this byte[] byteImageIn, int x1,int y1,int x2,int y2)
        {

            ImageConverter ic = new ImageConverter();
            Image src = (Image)(ic.ConvertFrom(byteImageIn)); 

            Bitmap target = new Bitmap(x2 - x1, y2 - y1);
            using (Graphics graphics = Graphics.FromImage(target))
                graphics.DrawImage(src, new Rectangle(0, 0, target.Width, target.Height),
                    new Rectangle(x1,y1,x2-x1,y2-y1), 
                    GraphicsUnit.Pixel);
            src = target;
            using (var ms = new MemoryStream())
            {
                src.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
                return ms.ToArray();
            }

 }

using System;
using System.Collections.Generic;
using System.IO;
using System.Reflection;
using System.Text.RegularExpressions;
using System.Web;
using System.Web.Script.Services;
using System.Web.Services;
using System.Web.UI;
using System.Web.UI.HtmlControls;

namespace AjaxTest
{
   public class KeyVal
   {
       public string Key { set; get; }
       public object Value { set; get; }
   }

   /// <summary>
   /// Summary description for Ajax
   /// </summary>
   [ScriptService]
   [WebService(Namespace = "http://tempuri.org/")]
   [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
   [System.ComponentModel.ToolboxItem(false)]
   public class Ajax : WebService
   {
       /// <summary>
       /// Removes Form tags using Regular Expression
       /// </summary>
       private static string cleanHtml(string html)
       {
           return Regex.Replace(html, @"<[/]?(form)[^>]*?>", string.Empty, RegexOptions.IgnoreCase);
       }

       /// <summary>
       /// تبدیل یک یوزر کنترل به معادل اچ تی ام ال آن
       /// </summary>
       /// <param name="path">مسیر یوزر کنترل</param>
       /// <param name="properties">لیست خواص به همراه مقادیر مورد نظر</param>
       /// <returns></returns>
       /// <exception cref="NotImplementedException"><c>NotImplementedException</c>.</exception>
       [WebMethod(EnableSession = true)]
       [ScriptMethod(ResponseFormat = ResponseFormat.Json)]
       public string RenderUserControl(string path,
             List<KeyVal> properties)
       {
           Page pageHolder = new Page();

           UserControl viewControl =
              (UserControl)pageHolder.LoadControl(path);

           viewControl.EnableViewState = false;

           Type viewControlType = viewControl.GetType();

           if (properties != null)
               foreach (var pair in properties)
               {
                   if (pair.Key != null)
                   {
                       PropertyInfo property =
                           viewControlType.GetProperty(pair.Key);

                       if (property != null)
                       {
                           if (pair.Value != null) property.SetValue(viewControl, pair.Value, null);
                       }
                       else
                       {
                           throw new NotImplementedException(string.Format(
                                                                 "UserControl: {0} does not have a public {1} property.",
                                                                 path, pair.Key));
                       }
                   }
               }

           //Form control is mandatory on page control to process User Controls
           HtmlForm form = new HtmlForm();

           //Add user control to the form
           form.Controls.Add(viewControl);

           //Add form to the page
           pageHolder.Controls.Add(form);

           //Write the control Html to text writer
           StringWriter textWriter = new StringWriter();

           //execute page on server
           HttpContext.Current.Server.Execute(pageHolder, textWriter, false);

           // Clean up code and return html
           return cleanHtml(textWriter.ToString());
       }       
   }
}

 <system.web.extensions>
   <scripting>
     <webServices>
       <jsonSerialization maxJsonLength="10000000"></jsonSerialization>
     </webServices>
   </scripting>
 </system.web.extensions>

$.fn.advloaduc = function(options) {
   var defaults = {
       webServiceName: 'Ajax.asmx', //نام فایل وب سرویس ما
       renderUCMethod: 'RenderUserControl', //متد وب سرویس
       ucMethodJsonParams: '{path:\'\'}',//پارامترهایی که قرار است پاس شوند
       completeHandler: null //پس از پایان کار وب سرویس این متد جاوا اسکریپتی فراخوانی می‌شود
   };
   var options = $.extend(defaults, options);

   return this.each(function() {
       var obj = $(this);
       obj.prepend("<div align='center'> لطفا اندکی تامل بفرمائید... <img src=\"images/loading.gif\"/></div>");

       $.ajax({
           type: "POST",
           url: options.webServiceName + "/" + options.renderUCMethod,
           data: options.ucMethodJsonParams,
           contentType: "application/json; charset=utf-8",
           dataType: "json",
           success:
                   function(msg) {
                       obj.html(msg.d);

                       // if specified make callback and pass element
                       if (options.completeHandler)
                           options.completeHandler(this);
                   },
           error:
                   function(XMLHttpRequest, textStatus, errorThrown) {
                       obj.html("امکان اتصال به سرور در این لحظه مقدور نیست. لطفا مجددا سعی کنید.");
                   }
       });
   });
};

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="part1.ascx.cs" Inherits="TestJQueryAjax.part1" %>
<asp:Label runat="server" ID="lblData" ></asp:Label>

using System;
using System.Threading;

namespace TestJQueryAjax
{
   public partial class part1 : System.Web.UI.UserControl
   {
       public string Text1 { set; get; }
       public string Text2 { set; get; }

       protected void Page_Load(object sender, EventArgs e)
       {
           Thread.Sleep(3000);
           if (!string.IsNullOrEmpty(Text1) && !string.IsNullOrEmpty(Text2))
               lblData.Text = Text1 + "<br/>" + Text2;
       }
   }
}

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="TestJQueryAjax._Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
   <title></title>

   <script src="js/jquery.js" type="text/javascript"></script>
   <script src="js/jquery.advloaduc.js" type="text/javascript"></script>
   <script src="js/json2.js" type="text/javascript"></script>

   <script type="text/javascript">
       function showAlert() {
           alert('finished!');
       }

       //تشکیل پارامترهای متد وب سرویس جهت ارسال به آن
       var fileName = 'part1.ascx';
       var props = [{ 'Key': 'Text1', 'Value': 'سطر یک' }, { 'Key': 'Text2', 'Value': 'سطر 2'}];
       var jsonText = JSON.stringify({ path: fileName, properties: props });

       $(document).ready(function() {
           $("#loadMyUc").advloaduc({
               webServiceName: 'Ajax.asmx',
               renderUCMethod: 'RenderUserControl',
               ucMethodJsonParams: jsonText,
               completeHandler: showAlert
           });
       });
  
   </script>

</head>
<body>
   <form id="form1" runat="server">
   <div id="loadMyUc">
   </div>
   </form>
</body>

</html>