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AutoGenerateColumn="false" is not Working in Vb.net only.

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Hi,

Gridview AutoGenerateColumn="false" is not Working in Vb.net only.But c# is working fine. I am tring 3 Days.But still i am not able to sove this  Problem.I don't Know AutoGenerateColumn="false" is posible or not posible in vb.net .  So I have attached my Design code and vb.net code . Please give me any one Solution.

Design Code:

<%@ Page Language="vb" AutoEventWireup="false" CodeBehind="WebForm4.aspx.vb" Inherits="cpmsGNXTWEB.WebForm4" %>

<!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>
</head>
<body>
<form id="form1" runat="server">
<div>
<table>
<tr>
<td>
<div>
<asp:GridView ID="gvPromo" runat="server" AutoGenerateColumns="false">
<Columns>
<asp:BoundField DataField="Message" HeaderText="Message" />
</Columns>
</asp:GridView>
</div>
</td>
</tr>
</table>
</div>
</form>
</body>
</html>

VB.Net Code:

Public Class WebForm4
Inherits System.Web.UI.Page
Dim dt As New DataTable
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
GetPromo()
End Sub

Private Sub GetPromo()
dt.Columns.Add("Message")
dt.Rows.Add("Message1")
dt.Rows.Add("Message2")
dt.Rows.Add("Message3")
gvPromo.DataSource = dt
gvPromo.DataBind()
End Sub

End Class



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