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POSpecified arguments was out of the range of valid values. Parameter name: index
 

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    <p>This was the original line in code-behind <strong>(CType(row.Cells(0).Controls(0), TextBox))</strong> and it didn't work. After that, I changed it to <strong>row.Cells(1)</strong> and received the above error when attempting to update a field in GridView. Here're the aspx markups:</p> <pre><code>&lt;asp:GridView ID="GridView1" runat="server" AllowPaging="True" AllowSorting="True" AutoGenerateColumns="False" CellPadding="4" DataKeyNames="TicketID" DataSourceID="historySqlDataSource" ForeColor="#333333" GridLines="None" Width="828px" OnRowEditing="GridView1_RowEditing" OnRowCancelingEdit="GridView1_RowCancelingEdit" OnRowUpdating="GridView1_RowUpdating"&gt; &lt;AlternatingRowStyle BackColor="White" ForeColor="#284775" /&gt; &lt;Columns&gt; &lt;asp:CommandField ShowEditButton="True" /&gt; &lt;asp:BoundField DataField="TicketID" HeaderText="TicketID" InsertVisible="False" ReadOnly="True" SortExpression="TicketID" /&gt; &lt;asp:BoundField DataField="DateCreated" HeaderText="DateCreated" SortExpression="DateCreated" /&gt; &lt;asp:BoundField DataField="FullName" HeaderText="FullName" SortExpression="FullName" /&gt; &lt;asp:BoundField DataField="Email" HeaderText="Email" SortExpression="Email" /&gt; &lt;asp:BoundField DataField="TicketType" HeaderText="TicketType" SortExpression="TicketType" /&gt; &lt;asp:BoundField DataField="Subject" HeaderText="Subject" SortExpression="Subject" /&gt; &lt;asp:BoundField DataField="Message" HeaderText="Message" SortExpression="Message" /&gt; &lt;asp:BoundField DataField="Status" HeaderText="Status" SortExpression="Status" /&gt; &lt;/Columns&gt; &lt;EditRowStyle BackColor="#999999" /&gt; &lt;FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" /&gt; &lt;HeaderStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" /&gt; &lt;PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" /&gt; &lt;RowStyle BackColor="#F7F6F3" ForeColor="#333333" /&gt; &lt;SelectedRowStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333" /&gt; &lt;SortedAscendingCellStyle BackColor="#E9E7E2" /&gt; &lt;SortedAscendingHeaderStyle BackColor="#506C8C" /&gt; &lt;SortedDescendingCellStyle BackColor="#FFFDF8" /&gt; &lt;SortedDescendingHeaderStyle BackColor="#6F8DAE" /&gt; &lt;/asp:GridView&gt; </code></pre> <p>And below are the code-behind:</p> <pre><code>Protected Sub GridView1_RowEditing(ByVal sender As Object, ByVal e As GridViewEditEventArgs) GridView1.EditIndex = e.NewEditIndex BindData() End Sub Protected Sub GridView1_RowCancelingEdit(ByVal sender As Object, ByVal e As GridViewCancelEditEventArgs) GridView1.EditIndex = 1 BindData() End Sub Protected Sub GridView1_RowUpdating(ByVal sender As Object, ByVal e As GridViewUpdateEventArgs) Dim dt = CType(Session("dt"), DataTable) 'if your current DataSource be in Session Dim row As GridViewRow = GridView1.Rows(e.RowIndex) dt.Rows(row.DataItemIndex)("TicketID") = (CType(row.Cells(1).Controls(0), TextBox)).Text dt.Rows(row.DataItemIndex)("DateCreated") = (CType(row.Cells(2).Controls(0), TextBox)).Text dt.Rows(row.DataItemIndex)("FullName") = (CType(row.Cells(3).Controls(0), TextBox)).Text dt.Rows(row.DataItemIndex)("TicketType") = (CType(row.Cells(4).Controls(0), TextBox)).Text dt.Rows(row.DataItemIndex)("Subject") = (CType(row.Cells(5).Controls(0), TextBox)).Text dt.Rows(row.DataItemIndex)("Message") = (CType(row.Cells(6).Controls(0), TextBox)).Text dt.Rows(row.DataItemIndex)("Status") = (CType(row.Cells(7).Controls(0), TextBox)).Text Session("dt") = dt GridView1.EditIndex = 1 BindData() End Sub Private Sub BindData() GridView1.DataBind() End Sub </code></pre>
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    1. COWhat didn't work with `Cells(0)`? Are you sure `Cells(7)` exists? You appear to be missing a column in `dt` for `DataField="Email"`.
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      1. USAndrew Morton
    2. CO@AndrewMorton: With Cells(0), the error stated **Unable to cast object of type 'System.Web.UI.WebControls.DataControlLinkButton' to type 'System.Web.UI.WebControls.TextBox'**. And you're right, I just noticed that I don't want the `DataField="Email"`. Does it matter if one of my fields in the database is **Null**?
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    3. COThe Cells(0) problem is understandable :) Does it work now that you have removed the Email datafield? For Null values, you can do a web search for `vb.net datatable database null value` to get a few suggestions if you find it is a problem.
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      1. USAndrew Morton
 

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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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