I used multi view in my web site. I wanna insert news in this website in step 1 I insert short description and some other data when I want to go to step 2 I received this error:
Invalid postback or callback argument. Event validation is enabled using in configuration or <%@ Page EnableEventValidation="true" %> in a page. For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.
code
<%@ Page Title="" Language="C#" MasterPageFile="~/AdminMaster.master" AutoEventWireup="true" CodeFile="AdminNews.aspx.cs" ValidateRequest="false" Inherits="AdminNews" %>
</asp:View>
<asp:View ID="Vnew" runat="server">
<div class="col-md-12 col-xs-12 col-sm-12">
<div class="col-md-1 col-xs-12 col-sm-1"></div>
<div class="col-md-10 col-xs-12 col-sm-10">
<section class="panel text-center">
<header class=" label label-info icon-plus-sign text-center">
درج خبر جدید
</header>
<div class="panel-body">
<div class="btn-group btn-group-justified">
<div class="col-md-12 col-xs-12 col-sm-12">
<form role="form">
<div class="form-group">
<label for="exampleInputEmail1" class="pull-right">نام:</label>
<asp:TextBox ID="txtNameNew" runat="server" type="text" class="form-control pull-right"></asp:TextBox>
</div>
<br />
<div class="form-group">
<label for="exampleInputPassword1" class="pull-right">تاریخ:</label>
<asp:TextBox ID="txtDateNew" runat="server" type="text" class="form-control pull-right" ></asp:TextBox>
</div>
<br />
<div class="form-group">
<label for="exampleInputPassword1" class="pull-right">دسته خبر: </label>
<asp:DropDownList ID="ddlCategoryNew" runat="server" CssClass=" form-control">
</asp:DropDownList>
</div>
<br />
<div class="form-group">
<label for="exampleInputPassword1" class="">توضیحات کوتاه </label>
<br />
<br />
<br />
<textarea id="txtShortDEsNew" cols="20" rows="10" runat="server" class="form-control pull-right"></textarea>
</div>
<div class=" form-group">
<label for="exampleInputFile" class="pull-Right"> یک تصویرانتخاب کنید.</label>
<asp:FileUpload ID="fuNew" CssClass="" runat="server" />
</div>
</form>
<asp:Label ID="lblWarning" runat="server" Text="هیچ تصویری انتخاب نکرده اید." CssClass="fixWarning2"></asp:Label>
<div class="col-md-2 col-xs-12 col-sm-2 "><div class="label-default"> </div></div>
<div class="pull-right col-md-10 col-xs-12 col-sm-10">
</div>
</div>
</div>
</div>
<div class="col-md-12 col-xs-12 col-sm-12 PaddingZiro">
<div class="col-md-1 col-xs-12 col-sm-1 pull-right"></div>
<div class="col-md-10 col-xs-12 col-sm-10 pull-right">
<div class="col-md-12 col-xs-12 col-sm-12 myheader">
<div class="col-md-1 col-xs-12 col-sm-1 pull-right"></div>
<div class="col-md-10 col-xs-12 col-sm-10 pull-right">
<div class="col-md-12 col-xs-12 col-sm-12 fixWarning2">
</div>
<div class="col-md-12 col-xs-12 col-sm-12 fixWarning2">
</div>
</div>
<div class="col-md-12 col-xs-12 col-sm-12 MarginBotom15">
<div class="pull-right col-md-3 col-xs-12 col-sm-3 NewSocialnetTTl">تصویر: </div>
</div>
<div class="col-md-12 col-xs-12 col-sm-12 MarginBotom15">
<div class="pull-right col-md-3 col-xs-12 col-sm-3 NewSocialnetTTl"></div>
<div class="pull-right col-md-9 col-xs-12 col-sm-9">
<asp:LinkButton ID="returnbtn" runat="server" CssClass="btn btn-warning pull-left" OnClick="lbtnReturn_Click">بازگشت</asp:LinkButton>
<asp:LinkButton ID="SocialRegist" runat="server" CssClass="btn btn-success pull-left MarginLeft20" OnClick="lbtnInsertStep1_Click">مرحله بعد</asp:LinkButton>
</div>
</div>
</div>
</div>
</div>
</div>
</section>
</div>
</div>
</asp:View>
<asp:View ID="vnewStep2" runat="server">
<div class="col-md-12 col-xs-12 col-sm-12 PaddingZiro">
<div class="col-md-1 col-xs-12 col-sm-1 pull-right"></div>
<div class="col-md-10 col-xs-12 col-sm-10 pull-right">
<div class="col-md-12 col-xs-12 col-sm-12 myheader">
توضیحات اصلی
<asp:Label ID="lblNewsMaxid" runat="server" Text="" Visible="false"></asp:Label>
</div>
</div>
</div>
<div class="col-md-12 col-xs-12 col-sm-12 PaddingZiro">
<div class="col-md-1 col-xs-12 col-sm-1 pull-right"></div>
<div class="col-md-10 col-xs-12 col-sm-10 pull-right">
<div class="col-md-12 col-xs-12 col-sm-12 myheader">
<div class="col-md-12 col-xs-12 col-sm-12 text-center fixWarning2 MarginBotom15">برای آپلود فایل از این قسمت می توانید استفاده کنید</div>
<div class="col-md-12 col-xs-12 col-sm-12 ">
<div class="col-md-3 col-xs-12 col-sm-3 pull-right"></div>
<div class="col-md-6 col-xs-12 col-sm-6 pull-right text-center">
<asp:Label ID="Label1" runat="server" Text="Label" CssClass="pull-right">انتخاب فایل</asp:Label>
<asp:LinkButton ID="btnAboutUsInsertFiles" runat="server" CssClass="btn btn-success pull-left" OnClick="btnInsertFiles_Click">ارسال</asp:LinkButton>
<asp:FileUpload ID="fuFilesTable" runat="server" CssClass="pull-left" />
</div>
<div class="col-md-3 col-xs-12 col-sm-3 pull-right"></div>
</div>
<div class="col-md-12 col-xs-12 col-sm-12 ">
<asp:Label ID="lblSiteName" runat="server" Text=""></asp:Label>
<asp:GridView ID="GVFilesTable" runat="server" AutoGenerateColumns="False" BackColor="White" BorderColor="#3366CC" BorderStyle="None" BorderWidth="1px" CellPadding="4" DataKeyNames="id" Width="100%" OnRowCommand="GVProductsFiles_RowCommand">
<Columns>
<asp:BoundField DataField="id" HeaderText="کد" HeaderStyle-CssClass="ProductBoxHeaderStyle">
<HeaderStyle CssClass="ProductBoxHeaderStyle" />
<ItemStyle HorizontalAlign="Center" VerticalAlign="Middle" BorderColor="#047269" BorderWidth="2px" />
</asp:BoundField>
<asp:BoundField DataField="Pic" HeaderText="عکس" HeaderStyle-CssClass="ProductBoxHeaderStyle">
<HeaderStyle CssClass="ProductBoxHeaderStyle" />
<ItemStyle HorizontalAlign="Center" VerticalAlign="Middle" BorderColor="#047269" CssClass="GVItemStyle" />
</asp:BoundField>
<asp:TemplateField HeaderText="حذف" HeaderStyle-CssClass="ProductBoxHeaderStyle">
<ItemTemplate>
<asp:LinkButton ID="btnProductDelletFile" runat="server" CssClass="btn btn-warning" Text="حذف" CommandArgument='<%#Eval("id") %>' CommandName="DeleteFile">حذف</asp:LinkButton>
</ItemTemplate>
<ItemStyle HorizontalAlign="Center" VerticalAlign="Middle" BorderColor="#047269" CssClass="GVItemStyle" />
</asp:TemplateField>
</Columns>
</asp:GridView>
</div>
<textarea id="txtLongDEsNew" cols="20" rows="25" runat="server"></textarea>
<asp:Label ID="lblRegistWarning" runat="server" Text="متن شما با موفقیت ذخیره شد" CssClass="fixWarning2"></asp:Label>
<div class="col-md-12 col-xs-12 col-sm-12 margintop10px">
<div class="col-md-3 col-xs-12 col-sm-3 pull-right"></div>
<div class="col-md-6 col-xs-12 col-sm-6 pull-right text-center">
<asp:LinkButton ID="btnAboutUsSave" runat="server" CssClass="btn btn-success pull-right" OnClick="lbtnInserStep2_Click">ذخیره</asp:LinkButton>
<asp:LinkButton ID="btnAboutUsReturn" runat="server" CssClass="pull-left btn btn-info" OnClick="lbtnReturn_Click">بازگشت</asp:LinkButton>
</div>
<div class="col-md-3 col-xs-12 col-sm-3 pull-right"></div>
</div>
</div>
</div>
</div>
</asp:View>
<asp:View ID="vEdith" runat="server">
<div class="col-md-12 col-xs-12 col-sm-12 PaddingZiro">
<div class="col-md-1 col-xs-12 col-sm-1 pull-right"></div>
<div class="col-md-10 col-xs-12 col-sm-10 pull-right">
<div class="col-md-12 col-xs-12 col-sm-12 myheader">
ویرایش
</div>
</div>
</div>
<div class="col-md-12 col-xs-12 col-sm-12 PaddingZiro">
<div class="col-md-1 col-xs-12 col-sm-1 pull-right"></div>
<div class="col-md-10 col-xs-12 col-sm-10 pull-right">
<div class="col-md-12 col-xs-12 col-sm-12 myheader">
<div class="col-md-12 col-xs-12 col-sm-12 text-center MarginBotom15">
<asp:ImageButton ID="img_edith" runat="server" />
</div>
<div class="col-md-12 col-xs-12 col-sm-12 MarginBotom15">
<div class="pull-right col-md-3 col-xs-12 col-sm-3 NewSocialnetTTl">ویرایش تصویر: </div>
<asp:FileUpload ID="fUEdith" runat="server" />
</div>
<div class="col-md-12 col-xs-12 col-sm-12 MarginBotom15">
<div class="pull-right col-md-2 col-xs-12 col-sm-2 NewSocialnetTTl">نام: </div>
<div class="pull-right col-md-10 col-xs-12 col-sm-10">
<asp:TextBox ID="txtNameEdith" runat="server" type="text" class="form-control pull-right"></asp:TextBox>
</div>
</div>
<div class="col-md-12 col-xs-12 col-sm-12 MarginBotom15">
<div class="pull-right col-md-2 col-xs-12 col-sm-2 NewSocialnetTTl">تاریخ </div>
<div class="pull-right col-md-10 col-xs-12 col-sm-10">
<asp:TextBox ID="txtDateEdith" runat="server" type="text" class="form-control pull-right"></asp:TextBox>
</div>
</div>
<div class="col-md-12 col-xs-12 col-sm-12 MarginBotom15">
<div class="pull-right col-md-2 col-xs-12 col-sm-2 NewSocialnetTTl">دسته بندی: </div>
<div class="pull-right col-md-10 col-xs-12 col-sm-10">
<asp:DropDownList ID="DdlCategoryEdith" runat="server" CssClass="form-control Myform-control">
</asp:DropDownList>
</div>
</div>
<div class="col-md-12 col-xs-12 col-sm-12 MarginBotom15">
<div class="pull-right col-md-2 col-xs-12 col-sm-2 NewSocialnetTTl">توضیحات کوتاه: </div>
<div class="pull-right col-md-10 col-xs-12 col-sm-10">
<textarea id="txtShortDescribEdith" cols="20" rows="10" runat="server" class="form-control pull-right"></textarea>
</div>
</div>
<div class="col-md-12 col-xs-12 col-sm-12 margintop10">
<div class="col-md-2 col-xs-12 col-sm-2 pull-right"></div>
<div class="col-md-8 col-xs-12 col-sm-8 pull-right text-center">
<asp:Label ID="Label3" runat="server" Text="Label" CssClass="pull-right">انتخاب فایل</asp:Label>
<asp:LinkButton ID="LinkButton8" runat="server" CssClass="btn btn-success pull-left" OnClick="lbtnSendFileInEdith_Click">ارسال</asp:LinkButton>
<asp:FileUpload ID="FuProductEdithINNEr" runat="server" CssClass="pull-left" />
<div class="col-md-12 col-xs-12 col-sm-12 margintop10">
<asp:Label ID="Label2" runat="server" Text=""></asp:Label>
<asp:GridView ID="GVproductFileinedith" runat="server" AutoGenerateColumns="False" BackColor="White" BorderColor="#3366CC" BorderStyle="None" BorderWidth="1px"
CellPadding="4" DataKeyNames="id" Width="100%" OnRowCommand="GVproductFileinedith_RowCommand">
<Columns>
<asp:BoundField DataField="id" HeaderText="کد" HeaderStyle-CssClass="ProductBoxHeaderStyle">
<HeaderStyle CssClass="ProductBoxHeaderStyle" />
<ItemStyle HorizontalAlign="Center" VerticalAlign="Middle" BorderColor="#047269" BorderWidth="2px" />
</asp:BoundField>
<asp:BoundField DataField="ApicUrl" HeaderText="آدرس" HeaderStyle-CssClass="ProductBoxHeaderStyle">
<HeaderStyle CssClass="ProductBoxHeaderStyle" />
<ItemStyle HorizontalAlign="Center" VerticalAlign="Middle" BorderColor="#047269" CssClass="GVItemStyle" />
</asp:BoundField>
<asp:TemplateField HeaderText="حذف" HeaderStyle-CssClass="ProductBoxHeaderStyle">
<ItemTemplate>
<asp:LinkButton ID="btnProductDelletFile" runat="server" CssClass="btn btn-warning" Text="حذف" CommandArgument='<%#Eval("id") %>' CommandName="DeleteFile">حذف</asp:LinkButton>
</ItemTemplate>
<ItemStyle HorizontalAlign="Center" VerticalAlign="Middle" BorderColor="#047269" CssClass="GVItemStyle" />
</asp:TemplateField>
</Columns>
</asp:GridView>
</div>
</div>
</div>
<div class="col-md-12 col-xs-12 col-sm-12 margintop10">
<textarea id="txtLongDescribeEdit" cols="20" rows="20" runat="server"></textarea>
</div>
<div class="col-md-12 col-xs-12 col-sm-12 margintop10px">
<div class="col-md-3 col-xs-12 col-sm-3 pull-right"></div>
<div class="col-md-6 col-xs-12 col-sm-6 pull-right text-center">
<asp:LinkButton ID="lbtnEdithNews" runat="server" CssClass="btn btn-success pull-right" OnClick="lbtnEdithNews_Click">ذخیره</asp:LinkButton>
<asp:LinkButton ID="lbtnReturn" runat="server" CssClass="pull-left btn btn-info" OnClick="lbtnReturn_Click">بازگشت</asp:LinkButton>
</div>
<div class="col-md-3 col-xs-12 col-sm-3 pull-right"></div>
</div>
</div>
</div>
</div>
</asp:View>
<asp:View ID="vDelet" runat="server">
<div class="col-md-12 col-xs-12 col-sm-12 PaddingZiro">
<div class="col-md-1 col-xs-12 col-sm-1 pull-right"></div>
<div class="col-md-10 col-xs-12 col-sm-10 pull-right">
<div class="col-md-12 col-xs-12 col-sm-12 myheader">
حذف
</div>
</div>
</div>
<div class="col-md-12 col-xs-12 col-sm-12 PaddingZiro">
<div class="col-md-1 col-xs-12 col-sm-1 pull-right"></div>
<div class="col-md-10 col-xs-12 col-sm-10 pull-right">
<div class="col-md-12 col-xs-12 col-sm-12 myheader">
آیا با حذف موافقید؟
<div class="col-md-12 col-xs-12 col-sm-12 MarginBotom15">
<div class="pull-right col-md-4 col-xs-12 col-sm-4 NewSocialnetTTl"></div>
<div class="pull-right col-md-4 col-xs-12 col-sm-4 text-center">
<asp:LinkButton ID="LinkButton2" runat="server" CssClass="btn btn-warning pull-left" OnClick="lbtnReturn_Click">بازگشت</asp:LinkButton>
<asp:LinkButton ID="LinkButton3" runat="server" CssClass="btn btn-success pull-right MarginLeft20" OnClick="lbtnDelet_Click">حذف</asp:LinkButton>
</div>
<div class="pull-right col-md-4 col-xs-12 col-sm-4 NewSocialnetTTl"></div>
</div>
</div>
</div>
</div>
</asp:View>
<asp:View ID="vComment" runat="server">
<div class="col-md-12 col-xs-12 col-sm-12 PaddingZiro">
<div class="col-md-1 col-xs-12 col-sm-1 pull-right"></div>
<div class="col-md-10 col-xs-12 col-sm-10 pull-right">
<div class="col-md-12 col-xs-12 col-sm-12 myheader text-center">
نظرات کاربران
<br />
<br />
<asp:Label ID="lblCommentWarning" runat="server" Text="در خواست شما با موفقیت انجام شد" CssClass="fixWarning" Visible="false"></asp:Label>
</div>
</div>
</div>
<div class="col-md-12 col-xs-12 col-sm-12 PaddingZiro">
<div class="col-md-1 col-xs-12 col-sm-1 pull-right"></div>
<div class="col-md-10 col-xs-12 col-sm-10 pull-right">
<div class="col-md-12 col-xs-12 col-sm-12">
<%-- every comment start from here--%>
<asp:DataList ID="dlMessage" runat="server" OnItemCommand="dlMessage_ItemCommand">
<ItemTemplate>
<div class="col-md-12 col-xs-12 col-sm-12 MarginBotom15 commentStyle">
<div class="col-md-4 col-xs-4 col-sm-4 pull-right">
<asp:Label ID="lblCommentName" runat="server" Text='<%#Eval("name") %>'></asp:Label>
</div>
<div class="col-md-4 col-xs-4 col-sm-4 pull-right text-center">
<div class="col-md-6 col-xs-12 col-sm-6 pull-right text-center">
<i class="fa fa-thumbs-o-up" aria-hidden="true"> </i>
<asp:Label ID="lblCommentLike" runat="server" Text='<%#Eval("cmlike") %>'></asp:Label>
</div>
<div class="col-md-6 col-xs-12 col-sm-6 pull-right text-center">
<i class="fa fa-thumbs-o-down" aria-hidden="true"> </i>
<asp:Label ID="lblCommentDisLike" runat="server" Text='<%#Eval("dislike") %>'></asp:Label>
</div>
</div>
<div class="col-md-4 col-xs-4 col-sm-4 pull-right">
<asp:LinkButton ID="lbtnCommentDelet" runat="server" CssClass=" btn btn-danger " data-toggle="tooltip" title="حذف" CommandName="delete" CommandArgument='<%#Eval("id")%>'>
<i class=" icon-trash" aria-hidden="true"></i>
</asp:LinkButton>
<asp:LinkButton ID="lbtnMCommentBlock" runat="server" CssClass="btn btn default pull-left hlBlock" data-toggle="tooltip" title="غیر فعال کردن" CommandName="block" CommandArgument='<%#Eval("id")%>'>
<i class=" icon-ban-circle " aria-hidden="true"></i>
</asp:LinkButton>
<span class="pull-left spacerStyle">/</span>
<asp:LinkButton ID="lbtnCommentActive" runat="server" CssClass="btn btn default pull-left hlActive" data-toggle="tooltip" title="فعال کردن" CommandName="active" CommandArgument='<%#Eval("id")%>'>
<i class=" icon-check " aria-hidden="true"></i>
</asp:LinkButton>
</div>
<div class="col-md-12 col-xs-12 col-sm-12 MarginBotom15 text-justify">
<asp:Label ID="lblCommentBody" runat="server" Text='<%#Eval("commentBdy") %>'></asp:Label>
</div>
<div class="col-md-12 col-xs-12 col-sm-12 MarginBotom15 text-justify">
<div class="col-md-2 col-xs-12 col-sm-2 pull-right text-center">
<asp:Label ID="lblCommentDate" runat="server" Text='<%#Eval("commentdate") %>'></asp:Label>
</div>
<div class="col-md-2 col-xs-12 col-sm-2 pull-right text-center">
<asp:Label ID="lblCommentTime" runat="server" Text='<%#Eval("time") %>'></asp:Label>
</div>
<div class="col-md-4 col-xs-12 col-sm-4 pull-right text-center">
<asp:Label ID="lblCommentip" runat="server" Text='<%#Eval("ip") %>'></asp:Label>
</div>
<div class="col-md-4 col-xs-12 col-sm-4 pull-right text-center">
<asp:Label ID="lblCommentEmail" runat="server" Text='<%#Eval("email") %>'></asp:Label>
</div>
</div>
</div>
</ItemTemplate>
</asp:DataList>
</div>
</div>
</div>
</asp:View>
</asp:MultiView>
</section>
</section>
</asp:Content>
whats wrong ?
