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Questionsession getting expired very frequently even session timeout has been set for 20 minute in asp.net 2.0. Pin
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QuestionError in editing a DetailsView with a dropdownlist Pin
eKardo22-Feb-10 9:31
eKardo22-Feb-10 9:31 
ASP.NET - C# (C Sharp) – SQL Server 2008

Hi!
I’ve got a master table and a child table. The master table has a nullable column called ReferenceID and in some cases it should be NULL, but when it’s null in a record, I get an error while going to Edit mode of DetailsView.
DB Tables:
MasterTable [Columns: MasterTableID (PK), Name, ReferenceID (FK)(Nullable)]<br />
ReferenceTable [Columns: ReferenceID (PK), Reference]<br />

<asp:DetailsView ID="DetailsView1" runat="server" AutoGenerateRows="False">
<Fields>
    <asp:BoundField DataField="MasterTableID" HeaderText="MasterTableID"/>
    <asp:BoundField DataField="Name" HeaderText="Name"/>
    <asp:TemplateField HeaderText="Reference" SortExpression="Reference">
        <EditItemTemplate>
            <asp:DropDownList ID="DropDownList_Reference" runat="server" 
                DataSourceID="ObjectDataSource_ReferenceTable" DataTextField="Reference" 
                DataValueField="ReferenceID" SelectedValue='<%# Bind("ReferenceID") %>'>
            </asp:DropDownList>
        </EditItemTemplate>
        <ItemTemplate>
            <asp:Label ID="LabelReference" runat="server" 
                Text='<%# Bind("Reference") %>'></asp:Label>
        </ItemTemplate>
    </asp:TemplateField>
    <asp:CommandField ShowDeleteButton="True" ShowEditButton="True" />
</Fields>
</asp:DetailsView>

Select Queries: 
Select MasterTable.*, ReferenceTable.Reference 
From MasterTable INNER JOIN
ReferenceTable ON MasterTable.ReferenceID = ReferenceTable.ReferenceID
Select * from ReferenceTable


In Read Only mode all everything is OK, but when I click on Edit and Postback happens, I get the following error:
'DropDownList_Reference ' has a SelectedValue which is invalid because it does not exist in the list of items.

Parameter name: value
It means that in MasterTable, the ReferenceID shouldn’t be NULL, but it should be in some cases.
I’d appreciate if someone give me a solution.
Kardo

AnswerRe: Error in editing a DetailsView with a dropdownlist Pin
Not Active22-Feb-10 11:48
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QuestionHelp with viewstate and gridview Pin
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