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POInvalid postback or callback argument. what is the issue with this code?
 

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  1. POInvalid postback or callback argument. what is the issue with this code?
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    <p>I have this gridview and i don't know what is the problem with the buttons inside it. I have this asp code:</p> <pre><code>&lt;asp:GridView ID="gvList" runat="server"&gt; &lt;Columns&gt; &lt;asp:TemplateField HeaderText="User Name" HeaderStyle-ForeColor="Black" HeaderStyle-Font-Bold="true"&gt; &lt;ItemTemplate&gt; &lt;asp:Label runat="server" ID="lblUsername" Text='&lt;%# Eval("cUserName") %&gt;'&gt;&lt;/asp:Label&gt; &lt;/ItemTemplate&gt; &lt;/asp:TemplateField&gt; &lt;asp:TemplateField HeaderText="Dept User" HeaderStyle-ForeColor="Black" HeaderStyle-Font-Bold="true"&gt; &lt;ItemTemplate&gt; &lt;asp:Label runat="server" ID="lblDept" Text='&lt;%# iif(Eval("lDeptUser"),"Yes","No") %&gt;'&gt;&lt;/asp:Label&gt; &lt;/ItemTemplate&gt; &lt;/asp:TemplateField&gt; &lt;asp:TemplateField HeaderText="Actions" HeaderStyle-ForeColor="black" HeaderStyle-Font-Bold="true"&gt; &lt;ItemTemplate&gt; &lt;asp:Button ID="btnedit" runat="server" Text="Edit" /&gt; &lt;asp:Button ID="btnDelete" OnClick="DeleteRow" runat="server" Text="Delete" /&gt; &lt;/ItemTemplate&gt; &lt;/asp:TemplateField&gt; &lt;/Columns&gt; &lt;/asp:GridView&gt; </code></pre> <p>And when i press delete or edit on any row it gives me error!! <code>Invalid postback or callback argument.</code></p> <p>This is my server side code in vb.net:</p> <pre><code>Public Function GetList() As DataTable Dim Query As String = "Select cUserName,lDeptUser FROM Intranet.dbo.Gn_ISCoordinators" Dim dt As DataTable = New DataTable() Using adapter = New SqlDataAdapter(Query, ConfigurationManager.ConnectionStrings("IntranetConnectionString").ConnectionString) adapter.Fill(dt) gvList.DataSource = dt gvList.DataBind() Return dt End Using End Function Public Function DelRow() As DataTable Dim strusername As String = CType(gvList.FindControl("lblUsername"), Label).Text.Trim() Dim Query As String = "Delete FROM Intranet.dbo.Gn_ISCoordinators where cUserName='" &amp; strusername &amp; "'" Dim dt As DataTable = New DataTable() Using Adapter = New SqlDataAdapter(Query, ConfigurationManager.ConnectionStrings("IntranetConnectionString").ConnectionString) Adapter.Fill(dt) Return dt End Using End Function Protected Sub DeleteRow(ByVal sender As Object, ByVal e As System.EventArgs) DelRow() End Sub Protected Sub Page_Load(sender As Object, e As System.EventArgs) Handles Me.Load GetList() End Sub Protected Sub gv(sender As Object, e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles gvList.RowDataBound e.Row.Cells(3).Visible = False e.Row.Cells(4).Visible = False End Sub End Class </code></pre> <p>I think that its from the client side. Please help me with this problem. btw i am not using any ajaxtoolkit till now and the <code>EnableEventValidation="true"</code> in the page as well as the web.config</p> <p>What is the problem and its solution, please help me.</p> <p>thanks in advance.</p>
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    1. US7alhashmi
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    1. COFirst i would wrap the code in _Page_Load_ in a `If Not IsPostBack Then GetList()`.
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      1. USTim Schmelter
    2. COit works ! but when i press on delete button it gives me `Object reference not set to an instance of an object.` on the `Dim strusername As String = CType(gvList.FindControl("lblUsername"), Label).Text.Trim()` line.
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      1. US7alhashmi
    3. CODont you need to handle this in the RowCommand event and check if CommandName=Delete. Then perform delete and in there rebind it. You should also put the initial bind in a postback check If Page.Ispostback = false then
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      1. USKay Nelson
 

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