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Updating a GridView that contain a dropdownlist using a Update SqlDataSource

I have created a aspx page that contains a gridview with a dropdownlist that will be updated for every row in the gridview.  I want to know the correct parameter values to use when setting up the sqldatasource.  I will be using a button to initate the process.  Below is my html.

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="AssignRole.aspx.vb" Inherits="AssignRole" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:Label ID="lblSSCampus" runat="server" Text="SS Campus:"></asp:Label>
        <asp:DropDownList ID="ddlSSCampus" runat="server" DataSourceID="SSCampusSqlDataSource" DataTextField="SchoolName" DataValueField="SchoolId">
        </asp:DropDownList><br />
        <br />
        <asp:Label ID="lblReqPosition" runat="server" Text="Requested Position:"></asp:Label>
        <asp:DropDownList ID="ddlPosition" runat="server" DataSourceID="PositionSqlDataSource" DataTextField="Name" DataValueField="PositionId">
        </asp:DropDownList><br />
        <br />
        <br />
        <asp:GridView ID="grdAssignRole" runat="server" AutoGenerateColumns="False" DataSourceID="RoleAssignmentSqlDataSource">
            <Columns>
                <asp:TemplateField HeaderText="Role" SortExpression="Role_name">
                    <EditItemTemplate>
                        <asp:DropDownList ID="ddlAssignRole" runat="server" DataSourceID="StatusSqlDataSource"
                            DataTextField="Role_Name" DataValueField="ID" SelectedIndex='<%#Bind("Id") %>'>
                        </asp:DropDownList>
                    </EditItemTemplate>
                    <ItemTemplate>
                        <asp:Label ID="lblRole" runat="server" Text='<%# Bind("Role_name")
                    %>'></asp:Label>
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:BoundField DataField="applicationId" HeaderText="applicationId" InsertVisible="False"
                    ReadOnly="True" SortExpression="applicationId" Visible="false" />
                <asp:BoundField DataField="FacultyName" HeaderText="FacultyName" ReadOnly="True"
                    SortExpression="FacultyName" />
                <asp:BoundField DataField="FacultyId" HeaderText="FacultyId" SortExpression="FacultyId" />
                <asp:BoundField DataField="StatusId" HeaderText="StatusId" SortExpression="StatusId" Visible="false" />
                <asp:BoundField DataField="Position" HeaderText="Position" SortExpression="Position" />
                <asp:BoundField DataField="SchoolName" HeaderText="Home Campus" ReadOnly="True" SortExpression="SchoolName" />
                <asp:BoundField DataField="OrderNo" HeaderText="OrderNo" SortExpression="OrderNo" Visible="false" />
                <asp:BoundField DataField="limitedAvailability" HeaderText="limitedAvailability"
                    ReadOnly="True" SortExpression="limitedAvailability" Visible="false" />
            </Columns>
        </asp:GridView>
        <asp:SqlDataSource ID="SSCampusSqlDataSource" runat="server" ConnectionString="<%$ ConnectionStrings:SummerSchoolConnectionString %>"
            SelectCommand="ssrSP_getAllSSCampuses" SelectCommandType="StoredProcedure">
            <SelectParameters>
                <asp:Parameter DefaultValue="4" Name="yrId" Type="Int32" />
            </SelectParameters>
        </asp:SqlDataSource>
   
    </div>
        <asp:SqlDataSource ID="PositionSqlDataSource" runat="server" ConnectionString="<%$ ConnectionStrings:SummerSchoolConnectionString %>"
            SelectCommand="refSP_getPositions" SelectCommandType="StoredProcedure">
            <SelectParameters>
                <asp:Parameter DefaultValue="0" Name="appId" Type="Int32" />
            </SelectParameters>
        </asp:SqlDataSource>
        <asp:SqlDataSource ID="RoleAssignmentSqlDataSource" runat="server" ConnectionString="<%$ ConnectionStrings:SummerSchoolConnectionString %>"
            SelectCommand="ssrSP_getRoleAssignments" SelectCommandType="StoredProcedure">
            <SelectParameters>
                <asp:Parameter DefaultValue="4" Name="yrId" Type="Int32" />
                <asp:ControlParameter ControlID="ddlSSCampus" DefaultValue="" Name="SSSchoolId" PropertyName="SelectedValue"
                    Type="String" />
                <asp:ControlParameter ControlID="ddlPosition" Name="Position" PropertyName="SelectedValue"
                    Type="Int32" />
                <asp:Parameter DefaultValue="0" Name="Status" Type="Int32" />
            </SelectParameters>
        </asp:SqlDataSource>
            <asp:SqlDataSource ID="RolesSqlDataSource" runat="server" ConnectionString="<%$ ConnectionStrings:SummerSchoolConnectionString %>"
            SelectCommand="ssrSP_getRoles" SelectCommandType="StoredProcedure">
            <SelectParameters>
                <asp:Parameter DefaultValue="1" Name="SSRole" Type="Int32" />
                <asp:Parameter DefaultValue="0" Name="admin" Type="Int32" />
                <asp:Parameter DefaultValue="4" Name="yrId" Type="Int32" />
                <asp:Parameter DefaultValue="''" Name="schCode" Type="String" />
            </SelectParameters>
        </asp:SqlDataSource>
        <asp:SqlDataSource ID="AssignRolesSqlDataSource" runat="server" UpdateCommand="ssrSP_assignRole" UpdateCommandType="StoredProcedure">
            <UpdateParameters>
                <asp:ControlParameter ControlID="grdAssignRole" Name="applicationId" PropertyName="Columns" />
                <asp:ControlParameter ControlID="grdAssignRole" Name="ddlAssignRole.SelectedValue" PropertyName="Columns" />
            </UpdateParameters>
        </asp:SqlDataSource>
    </form>
</body>
</html>



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