Which parameter do you use to retrieve column values in a GridView? - asp.net

Question

I need to make a delete statement for results that are displayed in my GridView. This delete statement must use some of the columns themselves as parameters in the delete statement
My gridview is this:
<asp:GridView
ID="GridView1"
runat="server"
AllowPaging="True"
AutoGenerateColumns="False"
DataSourceID="SqlDataSource1"
style="z-index: 1; left: 222px; top: 139px; position: absolute; height: 299px; width: 458px" DataKeyNames="Id">
<Columns>
<asp:CommandField ShowDeleteButton="True" />
<asp:BoundField DataField="Column1" HeaderText="Column1" SortExpression="Column1" ReadOnly="True" Visible="False" />
<asp:BoundField DataField="Id" HeaderText="Id" SortExpression="Id" ReadOnly="True" Visible="False" />
<asp:BoundField DataField="department" HeaderText="department" SortExpression="department" />
<asp:BoundField DataField="courseCode" HeaderText="courseCode" SortExpression="courseCode" />
<asp:BoundField DataField="courseName" HeaderText="courseName" SortExpression="courseName" />
</Columns>
</asp:GridView>
I need to use "Column1" and "Id" from my SELECT query (That is stored within a stored procedure) for the DELETE query that is ran when the "Delete" button is hit on my Gridview. A problem that may be happening is my select statement uses one primary key, but my delete statement needs two primary keys (which are "Column1" and "Id"), so I do not know what to set DataKeyNames to.
Here is the SQLDataSource:
<asp:SqlDataSource
ID="SqlDataSource1"
runat="server"
ConnectionString="<%$ ConnectionStrings:ConnectionString %>"
SelectCommand="GetPreviouslyTakenCourses"
SelectCommandType="StoredProcedure"
DeleteCommand="DELETE FROM UserHasCourse WHERE UserHasCourse.userId=#Column1 AND UserHasCourse.courseId=#Id"
DeleteCommandType="Text">
<SelectParameters>
<asp:SessionParameter DefaultValue="1" Name="userId" SessionField="userId" Size="10" Type="Int32" />
</SelectParameters>
<DeleteParameters>
<asp:Parameter Name="Column1" Type="Int32" />
<asp:Parameter Name="Id" Type="Int32" />
</DeleteParameters>
</asp:SqlDataSource>
As of now nothing happens when I hit "Delete" on the GridView, so I can imagine the problem I am having is almost fixed. I can imagine there is a problem with <asp:Parameter but I don't know what.

Answer 1

DataKeyNames should be set to
DataKeyNames="Column1,Id"
And this problem is fixed