file upload helper problem in ie

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ASP.NET

HTML

WebMatrix

@using Microsoft.Web.Helpers;

@{
    Page.Title = "orderReg";
    if(!WebSecurity.IsAuthenticated)
    {
       //navigate to login page
        Response.Redirect(App.PathUserLogin + "?returnUrl=" + Request.Url.LocalPath);
    }
    // Initialize page
    var FirstName = string.Empty;
    var LastName = string.Empty;
    int Gender = 1;
    int LangSelect = 1; 
    var Field = string.Empty;
    var Subject = string.Empty;
    bool FileValidator = true;
    var Description = string.Empty;
    List<string> lstFilePaths = new List<string>();
    Validation.RequireField("txtField", "specify ...");
    Validation.RequireField("txtSubject", "specify ...");
    // If this is a POST request, validate and process data
    if (IsPost && Validation.IsValid())
    {
        var db = Database.Open("Trans");
        //fetch User Details
        var UserProfileRow = db.QuerySingle("SELECT * FROM UserProfile WHERE Id = " + WebSecurity.CurrentUserId);
        Gender = Convert.ToInt32(UserProfileRow.Gender);
        FirstName = UserProfileRow.FirstName;
        LastName = UserProfileRow.LastName;
        LangSelect = Convert.ToInt32(Request.Form["LangSelect"]);
        Field = Request.Form["txtField"];
        Subject = Request.Form["txtSubject"];
        Description = Request.Form["txtDescription"];
        //validate file(s)
        lstFilePaths.Clear();
        for(int i = 0; i < Request.Files.Count; i++)
        {
            if(Request.Files[i].ContentLength == 0)
            {
                    FileValidator = false;
                    break;
            }
            else
            {
                lstFilePaths.Add(Request.Files[i].FileName);
            }
        }
        if(FileValidator == true)
        {
            //update db
            int AuditNum = 1000;
            if(db.QueryValue("SELECT COUNT(*) FROM OrderStatus") > 0)
            {
                AuditNum = db.QueryValue("SELECT MAX(AuditNum) FROM OrderStatus") + 1;
            }
            string ConcatFileNames = AuditNum.ToString() + "_";
            //upload file
            for(int i = 0; i < Request.Files.Count; i++)
            {
                var uploadedFile = Request.Files[i];
                var fileName = Path.GetFileName(uploadedFile.FileName);
                var SavedFileName = AuditNum.ToString() + "_" + fileName;
                var DirectorySavePath = Server.MapPath("~/App_Data/UploadedFiles/" + AuditNum + "/In/");
                var fileSavePath = Server.MapPath("~/App_Data/UploadedFiles/" + AuditNum + "/In/" + SavedFileName);// + FileExt);   
                Directory.CreateDirectory(DirectorySavePath);
                uploadedFile.SaveAs(fileSavePath);
                var ShortFileName = string.Empty;
                if(fileName.Length > 6)
                {
                    ShortFileName = fileName.Substring(0,6);
                }
                else
                {
                    ShortFileName = fileName;
                }
                ConcatFileNames += ShortFileName + "_";
            }
            //insert order status information
            db.Execute(@"
                INSERT INTO OrderStatus 
                (AuditNum, Price, Status, PricingTime, WordsNum, DeliveryTime) 
                VALUES (@0, @1, @2, @3, @4 , @5)", 
                AuditNum, null, App.strUnVisited, null, null, null);
            
            db.Execute(@"
                INSERT INTO OrderDetails 
                (FileName, Lang, Description, Time, UserId, Subject, Field, AuditNum) 
                VALUES (@0, @1, @2, @3, @4, @5, @6, @7)", 
                ConcatFileNames, LangSelect, Description, DateTime.Now, WebSecurity.CurrentUserId, Subject, Field, AuditNum );
            db.Close();
            db.Dispose();
            Session["Description"] = Description;
            Session["lstFilePaths"] = lstFilePaths;
            string SendingParams = "AuditNum=" + AuditNum + "&FirstName=" + FirstName + "&LastName=" + LastName 
            + "&Gender=" + Gender + "&LangSelect=" + LangSelect + "&Field=" + Field + "&Subject=" + Subject;
            Response.Redirect("~/Orders/OrderConf?" + SendingParams);
        }
    }
}

@if(IsPost && !Validation.IsValid() )
{
    <div id ="ErrorBorder">  
        <p>correvt...</p> <br/>
        @Html.ValidationSummary()
    </div>
}

<form method="post" action="" enctype="multipart/form-data">
    <fieldset>
        <legend>سفارش ترجمه</legend>
                
        <table class="InTheForm">
            <!--<caption>سفارش</caption>-->
            <tr>
                <th rowspan="2">lang</th>
                <td>
                    <input type="radio" name="LangSelect" value="1" @(LangSelect == 1 ? "checked = 'checked'" : "")/>e2p<br/>
                </td>
            </tr>
            <tr>
                <td>
                    <input type="radio" name="LangSelect" value="0" @(LangSelect == 0 ? "checked = 'checked'" : "")/>p2e
                </td>
            </tr>
            <tr>
                <th>field</th>
                <td>
                    <input type="text" name="txtField" value="@Field"/>
                    <span class="Star">*</span>
                </td>
                <td><div style="font-size: smaller">examples...</div></td>
            </tr>
            <tr>
                <th>subj</th>
                <td>
                    <input type="text" name="txtSubject" value="@Subject"/>
                    <span class="Star">*</span>
                </td>
            </tr>
            <tr>
                <th>files...</th>
                        
                <td>
                    @FileUpload.GetHtml(
                        initialNumberOfFiles:1,
                        allowMoreFilesToBeAdded:true,
                        includeFormTag:true,
                        uploadText:"Upload")    <!--upload button is hidden using CSS-->
                    @if (IsPost) {
                        if(FileValidator == true && Validation.IsValid())
                        {
                            <span>uploaded</span> <br/>
                        }
                        else if (FileValidator == false)
                        {
                            <span>error...</span> <br/>
                        }
                    }
                </td>
                        
            </tr>
            <tr>
                <th>commects</th>
                <td><textarea name="txtDescription" rows="5" style="width: 100%"></textarea></td>
            </tr>
            <tr>
                <td colspan="2" style="text-align: center"><input type="submit" value="send"/></td>
            </tr>
        </table>
    </fieldset>
</form>

I have got a form in my page which contains a file upload helper and a submit button (and some other controls). My page is working fine and the form can be submitted when browsed by firefox or chrome. But in ie when I press the submit button nothing happens (the form is not submitted to the server). What can cause this browser-specific problem?