Gridview text box column loses value after changing .Visible property

Discussion in 'ASP .Net' started by landesjoe@yahoo.com, Feb 5, 2007.

  1. Guest

    Hi,
    here's my problem in short: Text boxes in gridview don't seem to hold
    their value if the column's .Visible property is changed back and
    forth.

    I've got a form with a gridview populated from a data view (which in
    turn is loaded from a manually setup DataTable for testing purposes).
    One of the columns in the grid is a checkbox that's tied to an event
    handler that'll change the .Visible property of a column with a text
    box. That text box column (column 6 in the example code below)
    initially has a numeric value, but after hiding and showing again is
    blank.
    EnableViewState is set to True for the form, Gridview and text box.

    Got any suggestions?

    Thanks,
    Joe Landes

    ASP code to setup the control:
    <asp:GridView ID="gvItems" runat="server" Height="59px"
    Width="662px" Style="left: 17px;
    position: relative; top: -1px" AllowSorting="True"
    AutoGenerateColumns="False">
    <Columns>
    <asp:TemplateField HeaderText="Use" InsertVisible="False">
    <EditItemTemplate>
    &nbsp;
    </EditItemTemplate>
    <ItemTemplate>
    <asp:CheckBox ID="chkSelected" runat="server"
    AutoPostBack="True" CausesValidation="True"
    OnCheckedChanged="chkSelected_CheckedChanged" /
    >

    </ItemTemplate>
    </asp:TemplateField>
    <asp:HyperLinkField HeaderText="Order #"
    DataTextField="OrderNum" NavigateUrl="~/Login.aspx" />
    <asp:BoundField DataField="OrderID" HeaderText="OEM #"
    ReadOnly="True" />
    <asp:BoundField DataField="UnitPrice"
    DataFormatString="${0:C2}" HeaderText="Price"
    ReadOnly="True" HtmlEncode="False" />
    <asp:BoundField DataField="UnitCost"
    DataFormatString="{0:c2}" HeaderText="Cost"
    HtmlEncode="False" />
    <asp:BoundField DataField="QtyShipped" HeaderText="Qty
    Shipped" ReadOnly="True">
    <ControlStyle Width="20px" />
    </asp:BoundField>
    <asp:TemplateField HeaderText="Qty Returnable">
    <EditItemTemplate>
    <asp:TextBox ID="txtQtyToRA" runat="server" Text='<
    %# Eval("QtyToRA") %>' Width="40px"></asp:TextBox>
    </EditItemTemplate>
    <ControlStyle Width="20px" />
    <ItemTemplate>
    <asp:TextBox ID="txtQtyToRA" runat="server"
    MaxLength="4" Text='<%# Eval("QtyToRA") %>'
    Width="40px"></asp:TextBox>
    <asp:RangeValidator ID="rgvQtyToRA" runat="server"
    ControlToValidate="txtQtyToRA"
    MinimumValue="0" MaximumValue='<%#
    Eval("QtyShipped") %>' Type="Integer" Display="Dynamic"></
    asp:RangeValidator>
    </ItemTemplate>
    </asp:TemplateField>
    <asp:BoundField DataField="ShipFrom" HeaderText="Ship
    From" ReadOnly="True" />
    <asp:TemplateField HeaderText="Return Reason">
    <ItemTemplate>
    <asp:DropDownList ID="cboRAReason" runat="server"
    Width="170px">
    </asp:DropDownList>
    </ItemTemplate>
    </asp:TemplateField>
    </Columns>
    <PagerTemplate>
    not this way<br />
    <br />
    </PagerTemplate>
    <AlternatingRowStyle BackColor="#FFFFC0" />
    </asp:GridView>


    Here's the event handler:
    Protected Sub chkSelected_CheckedChanged(ByVal sender As
    System.Object, ByVal e As System.EventArgs)
    ' Check status of ctonrols
    CheckControlStatus()
    gvItems.Columns(6).Visible = Not gvItems.Columns(6).Visible
    End Sub
    , Feb 5, 2007
    #1
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