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How to capture the value from a dropdown list from InsertItemTemplate in a GridTemplateColumn?

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This is a migrated thread and some comments may be shown as answers.
Jerald
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Jerald asked on 18 Oct 2016, 01:34 PM

I have a grid control with a GridTemplateColumn that contains an ItemTemplate and an InsertItemTemplate.  The InsertItemTemplate contains a dropdown list.  The problem is that I get a null reference exception when I try to insert a new record.  I know that the issue lies in the code behind where I am using the following line:

new_doc_stat_cmd.Parameters.AddWithValue("@docStat", rg_doc_stats.MasterTableView.FindControl("docStatDdlInsert"));

 

When I replace the above line with the one below, the insert command is executed successfully:

new_doc_stat_cmd.Parameters.AddWithValue("@docStat", 4);

 

Here is the code for the grid:

<telerik:RadGrid
                ID="rg_doc_stats"
                runat="server"
                DataSourceID="sdc_doc_stats"
                AllowSorting="True"
                Skin="Office2010Blue"
                CellSpacing="-1"
                GridLines="Both"
                OnInsertCommand="rg_doc_stats_InsertCommand">
                <ClientSettings AllowColumnsReorder="True" ReorderColumnsOnClient="True"></ClientSettings>
                <MasterTableView DataSourceID="sdc_doc_stats" AutoGenerateColumns="False" DataKeyNames="docStatIdPk" CommandItemDisplay="Top">
                    <Columns>
                        <telerik:GridBoundColumn DataField="docStatIdPk" ReadOnly="True" HeaderText="docStatIdPk" SortExpression="docStatIdPk" UniqueName="docStatIdPk" DataType="System.Int32" FilterControlAltText="Filter docStatIdPk column"></telerik:GridBoundColumn>
                         
                        <telerik:GridTemplateColumn DataField="docStat" HeaderText="Status" SortExpression="docStat" UniqueName="docStat" DataType="System.Int32" FilterControlAltText="Filter docStat column">
                            <ItemTemplate>
                                <asp:Label runat="server" Text='<%# Bind("stat") %>' ID="statLbl"></asp:Label>
                            </ItemTemplate>
                            <InsertItemTemplate>
                                <asp:DropDownList ID="docStatDdlInsert" runat="server" SelectedValue='<%# Bind("docStat") %>' DataSourceID="sdc_stats" DataTextField="stat" DataValueField="statIdPk" AppendDataBoundItems="true"><asp:ListItem Value="">--Please Select--</asp:ListItem></asp:DropDownList>
                            </InsertItemTemplate>
                        </telerik:GridTemplateColumn>
 
                        <telerik:GridBoundColumn DataField="docStatDt" HeaderText="Status Date" SortExpression="docStatDt" UniqueName="docStatDt" FilterControlAltText="Filter docStatDt column" DataType="System.DateTime" ReadOnly="true"></telerik:GridBoundColumn>
                        <telerik:GridBoundColumn DataField="docStatSetBy" HeaderText="Status Set By" SortExpression="docStatSetBy" UniqueName="docStatSetBy" FilterControlAltText="Filter docStatSetBy column" ReadOnly="true"></telerik:GridBoundColumn>
                        <telerik:GridBoundColumn DataField="docIdFk" HeaderText="docIdFk" SortExpression="docIdFk" UniqueName="docIdFk" DataType="System.Int32" FilterControlAltText="Filter docIdFk column" ReadOnly="true"></telerik:GridBoundColumn>
                         
                    </Columns>
                </MasterTableView>
            </telerik:RadGrid>
        </telerik:RadPageView>

 

Here are the InsertParameters from the SqlDataSource:

<InsertParameters>
<asp:Parameter Name="docStat" Type="Int32"></asp:Parameter>
<asp:Parameter Name="docStatDt" Type="DateTime"></asp:Parameter>
<asp:Parameter Name="docStatSetBy" Type="String"></asp:Parameter>
<asp:Parameter Name="docIdFk" Type="Int32"></asp:Parameter>
 </InsertParameters>

 

Here is the InsertCommand from the SqlDataSource:

InsertCommand="INSERT INTO [docStats] ([docStat], [docStatDt], [docStatSetBy], [docIdFk]) VALUES (@docStat, @docStatDt, @docStatSetBy, @docIdFk)"

 

Here is the InsertCommand from the code behind:

protected void rg_doc_stats_InsertCommand(object sender, GridCommandEventArgs e)
        {
            SqlConnection drap_cnxn = new SqlConnection("Server=Mine\\SQLEXPRESS;Initial Catalog=drap;Integrated Security=True;");
            {
                SqlCommand new_doc_stat_cmd = new SqlCommand("Insert Into docStats(docStat, docStatDt, docStatSetBy, docIdFk) Values(LTRIM(RTRIM(@docStat)), LTRIM(RTRIM(@docStatDt)), LTRIM(RTRIM(@docStatSetBy)), LTRIM(RTRIM(@docIdFk)))", drap_cnxn);
                new_doc_stat_cmd.Parameters.AddWithValue("@docStat", rg_doc_stats.MasterTableView.FindControl("docStatDdlInsert"));               
                new_doc_stat_cmd.Parameters.AddWithValue("@docStatDt", DateTime.Now.ToString());
                new_doc_stat_cmd.Parameters.AddWithValue("@docStatSetBy", HttpContext.Current.User.Identity.Name);
                new_doc_stat_cmd.Parameters.AddWithValue("@docIdFk", hdn_doc_id.Value);
 
                drap_cnxn.Open();
                new_doc_stat_cmd.ExecuteNonQuery();
                drap_cnxn.Close();
 
                if (IsPostBack)
                {
                    rg_ven_docs.DataBind();
                    rg_doc_stats.DataBind();
                }                   
            }
        }

 

Thank you,

J

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Vasil
Telerik team
answered on 21 Oct 2016, 07:18 AM
Hello Jerald,

You need to get the value of the DropDownList and pass it to the parameters. Instead of the whole DropDownList itself.

Try out this approach:

DropDownList ddl = rg_doc_stats.MasterTableView.FindControl("docStatDdlInsert") as DropDownList;
 
new_doc_stat_cmd.Parameters.AddWithValue("@docStat", ddl.SelectedItem.Value);


Regards,
Vasil
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