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Update DB From a Drop Down within a Grid View , ASP.NET

Posted on 2009-07-08
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Last Modified: 2012-05-07
Hello,
I have one ASP.NET Grid view GV1, containing one template field. "Reason"
in the Edit Item Template, i have one Drop Down DD1, and i want that when the user hits edit, to be able to choose a value from the DD, which will be updated in the underlying Data Base.

The DD1, is not data bound, it has list items.
Now when i am updating from the GV1, a null value is going to the DB.

How can i make only one selected value from the DD1, updatable in the DB?
thanks

<asp:TemplateField HeaderText="Reason">

                <EditItemTemplate>

                    <asp:DropDownList ID="DD1" runat="server" 

                        Font-Names="Cambria" Font-Size="8pt"  >

                        <asp:ListItem>R1</asp:ListItem>

                        <asp:ListItem>R2</asp:ListItem>

                        <asp:ListItem>R3</asp:ListItem>

                        <asp:ListItem>R4</asp:ListItem>

                        <asp:ListItem>Other</asp:ListItem>

                    </asp:DropDownList>  

                </EditItemTemplate>

                <ItemTemplate>

                    <asp:Label ID="Label1" runat="server" Text='<%# Bind("AppReas") %>'></asp:Label>

                </ItemTemplate>

            </asp:TemplateField>

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Question by:Nyana22
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Expert Comment

by:guru_sami
ID: 24804695
So whatever you select...and click update...it is passing null value ...right?

Can you also share your dataSource code...also any relevant code from your code-behind.
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Author Comment

by:Nyana22
ID: 24804783
Yes Sami, That true,
For display :
There is a stored procedure to select data from 2 tables,
For update
also a SP to update one table.

There is one class containing 2 functions, one for selection, one for the update,
The update function has all the GV field as parameter.

There is no Code behind.

Also,
the update statement in the DB finds a record in the update table by to fields, because the combinaison is the key. This same combination i set it to DataKeys name of the GV.

And i also bound the 2 key field from the data source to the grid view, but i set their visible propriety to False.

The update function in the DAL, is a simple call to the SP, using ADO class,
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LVL 41

Expert Comment

by:guru_sami
ID: 24804888
So you are using ObjectDataSource to do this update ? if so can you share the markup ..
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Author Comment

by:Nyana22
ID: 24804940
yes i do use an ODS, and here is the markup,
By the way, in the GV, i have only one bound field, and all the other are template.

The user need to update or the bound field or this template containing the DD.

I tried to update the bound field , and its working good.
    <asp:ObjectDataSource ID="getDetailODS" runat="server" SelectMethod="getCountDetail"

        TypeName="CountDiscAL" UpdateMethod="upCountDetail">

        <SelectParameters>

            <asp:Parameter DefaultValue="2" Name="CountNo" Type="Int32" />

            <asp:Parameter Name="onlyDisc" Type="String" />

            <asp:Parameter Name="ifApp" Type="String" />

            <asp:Parameter Name="ifCorr" Type="String" />

            <asp:Parameter Name="itemSrch" Type="String" />

            <asp:Parameter Name="descSrch" Type="String" />

        </SelectParameters>

        <UpdateParameters>

            <asp:Parameter Name="itemNo" Type="String" />

            <asp:Parameter Name="itemDesc" Type="String" />

            <asp:Parameter Name="PhysicalCount" Type="Decimal" />

            <asp:Parameter Name="MaxCurrent" Type="Decimal" />

            <asp:Parameter Name="Discrepency" Type="Decimal" />

            <asp:Parameter Name="dApproved" Type="String" />

            <asp:Parameter Name="AppReas" Type="String" />

            <asp:Parameter Name="dCorrected" Type="Int32" />

            <asp:Parameter Name="pCountID" Type="Int32" />

            <asp:Parameter Name="itemWarPK" Type="Int32" />

        </UpdateParameters>

    </asp:ObjectDataSource>

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Accepted Solution

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guru_sami earned 500 total points
ID: 24805919
Try this:
1: Remove <asp:Parameter Name="AppReas" Type="String" />
from your UpdateParameters list
2: Add this parameter to the collection in your GV RowUpdating event handler like below:

Protected Sub GridView1_RowUpdating(ByVal sender As Object, ByVal e As GridViewUpdateEventArgs)
    Dim ddl As DropDownList = DirectCast(GridView1.Rows(e.RowIndex).FindControl("DD1"), DropDownList)
    SqlDataSource1.UpdateParameters.Add("Age", ddl.SelectedValue)
End Sub
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Author Comment

by:Nyana22
ID: 24806272
thanks,
it worked, but what's all that about?
i appreciate some clarification,
thanks
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LVL 41

Expert Comment

by:guru_sami
ID: 24806324
looks since your DDL is not Databounded you parameter was never assigned the value from the DDL implicitly
what the code does is assign the ddl selected value to the parameter explicitly like:
  SqlDataSource1.UpdateParameters.Add("Age", ddl.SelectedValue)
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