Updating value picked from DDL in DetailView - asp.net

Question

(I found the way it's supposed to be done as shown in my Answer below.
I'm editing my question and deleting the code I initially put here, which was a mess, leaving just the definitions).
Win7, ASP4.5, empty_web_app in VS2013 with C#. Recreated in a very simple project accessing two tables:
1st table "Students"
student_ID
student_name
student_course_ID (is Forign Key)
2nd table "Courses"
course_ID
course_name
In my web page I have DetailView1 showing details of student who's student_ID is taken from txbStudent_ID.
DetailView1 has Edit Delete and New.
When in UPDATE or INSERT mode I need to show the course_name (rather then the course ID) in a drop-down-list and update/insert accordingly.
No code behind.
My answer below is applicable to GRIDVIEW as well.
Gadi

Answer 1

I was so wrong they way I coded my aspx.
So here is the right way to do it, for future beginners like I am now...
(with the help of https://msdn.microsoft.com/en-us/library/ms178294(v=vs.140).aspx)
<asp:Label ID="Label1" runat="server" Text="Student_ID"></asp:Label>
<asp:TextBox ID="txbStudent_ID" runat="server"></asp:TextBox>
<br />
<asp:DetailsView ID="DetailsView1" runat="server" AutoGenerateRows="False" DataKeyNames="student_ID" DataSourceID="SqlDataSource1" Height="50px" Width="125px">
<Fields>
<asp:BoundField DataField="student_ID" HeaderText="student_ID" InsertVisible="False" ReadOnly="True" SortExpression="student_ID" />
<asp:BoundField DataField="student_name" HeaderText="student_name" SortExpression="student_name" />
<asp:TemplateField HeaderText="student_course_ID" SortExpression="student_course_ID">
<EditItemTemplate>
<asp:DropDownList
ID="DropDownList1"
runat="server"
DataSourceID="SqlDataSource2"
DataTextField="course_name"
DataValueField="course_ID"
SelectedValue='<%# Bind("student_course_ID") %>'>
</asp:DropDownList>
</EditItemTemplate>
<InsertItemTemplate>
<asp:DropDownList
ID="DropDownList2"
runat="server"
DataSourceID="SqlDataSource2"
DataTextField="course_name"
DataValueField="course_ID"
SelectedValue='<%# Bind("student_course_ID") %>'>
</asp:DropDownList>
</InsertItemTemplate>
<ItemTemplate>
<asp:Label
ID="Label1"
runat="server"
Text='<%# Bind("student_course_ID") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:CommandField ShowEditButton="True" ShowInsertButton="True" ShowDeleteButton="True" />
</Fields>
</asp:DetailsView>
<asp:SqlDataSource
ID="SqlDataSource1"
runat="server"
ConnectionString="<%$ ConnectionStrings:Course_Student_Connection %>"
InsertCommand="INSERT INTO [Students] ([student_name], [student_course_ID]) VALUES (#student_name, #student_course_ID)"
SelectCommand="SELECT * FROM [Students] WHERE ([student_ID] = #student_ID)"
UpdateCommand="UPDATE [Students] SET [student_name] = #student_name, [student_course_ID] = #student_course_ID WHERE [student_ID] = #student_ID"
DeleteCommand="DELETE FROM [Students] WHERE [student_ID] = #student_ID">
<DeleteParameters>
<asp:Parameter Name="student_ID" Type="Int32" />
</DeleteParameters>
<InsertParameters>
<asp:Parameter Name="student_name" Type="String" />
<asp:Parameter Name="student_course_ID" Type="Int32" />
</InsertParameters>
<SelectParameters>
<asp:ControlParameter ControlID="txbStudent_ID" Name="student_ID" PropertyName="Text" Type="Int32" />
</SelectParameters>
<UpdateParameters>
<asp:Parameter Name="student_name" Type="String" />
<asp:Parameter Name="student_course_ID" Type="Int32" />
<asp:Parameter Name="student_ID" Type="Int32" />
</UpdateParameters>
</asp:SqlDataSource>
<asp:SqlDataSource
ID="SqlDataSource2"
runat="server"
ConnectionString="<%$ ConnectionStrings:Course_Student_Connection %>"
SelectCommand="SELECT [course_ID], [course_name] FROM [Courses]">
</asp:SqlDataSource>
I do hope it will save some time for others.
Stackoverflow is THE greatest and by far the best Q&A site on the web!!!
Gadi.