using a master page breaks my SQLDataSource.Insert operation

[JGALEY]

I have a working page that I transplanted into master/content page arrangement. When running the page now, things that used to work, like inserting a record using a SQLDataSource, no longer work. SQL Server returns an error saying I cannot insert a null in a column, but the Insert parameters and such all work great in the old page with no master.

What could I have done wrong? Thanks in advance...

Code for content page:

<%@ Page Language="C#" MasterPageFile="~/masters/GradeBook.master" AutoEventWireup="true" CodeFile="TestStudent.aspx.cs" Inherits="TestStudent" Title="Untitled Page" %>
<asp:Content ID="Content1" ContentPlaceHolderID="main" Runat="Server">
    <asp:SqlDataSource ID="datasrcStudent" runat="server" ConnectionString="<%$ ConnectionStrings:CR_GradeBookConnectionString %>"
        InsertCommand="AddStudent" InsertCommandType="StoredProcedure" 
        SelectCommand="SELECT STU_FName, STU_LName, GL_UID FROM dbo.Student WHERE STU_UID = @STU_UID"
        DataSourceMode="DataReader"
        UpdateCommand="UpdateStudent" UpdateCommandType="StoredProcedure" >
        <InsertParameters>
            <asp:ControlParameter ControlID="txtFName" Name="STU_FName" Type="String" PropertyName="text" />
            <asp:ControlParameter ControlID="txtLName" Name="STU_LName" Type="String" PropertyName="text" />
            <asp:ControlParameter ControlID="ddlGradeLevel" Name="GL_UID" Type="Int32" PropertyName="SelectedValue" />
        </InsertParameters>
        <SelectParameters>
                    <asp:FormParameter Name="STU_UID" Type="Int32" FormField="txtUID" />
        </SelectParameters>
        <UpdateParameters>
            <asp:FormParameter Name="STU_UID" Type="String" FormField="txtUID"  />
            <asp:FormParameter Name="STU_FName" Type="String" FormField="txtFName"  />
            <asp:FormParameter Name="STU_LName" Type="String" FormField="txtLName" />
            <asp:FormParameter Name="GL_UID" Type="Int32" FormField="ddlGradeLevel"/>
        </UpdateParameters>
            </asp:SqlDataSource>
    <div id="content">
        <h1>
            Add Student/Edit Student Info</h1>
        <table border="1" cellpadding="5" style="width: 500px">
            <tr>
                <td class="tblLeftCol">
                    <div class="divLabel">*First Name</div>
                </td>
                <td class="tblRightCol">
                    <asp:TextBox ID="txtFName" runat="server"></asp:TextBox>
                    <asp:TextBox ID="txtUID" runat="server"></asp:TextBox></td>
            </tr>
            <tr>
                <td class="tblLeftCol">
                    <div class="divLabel">*Last Name</div>
                </td>
                <td class="tblRightCol">
                    <asp:TextBox ID="txtLName" runat="server"></asp:TextBox></td>
            </tr>
            <tr>
                <td class="tblLeftCol">
                    <div class="divLabel">*Grade Level</div>
                </td>
                <td class="tblRightCol">
                    <asp:DropDownList ID="ddlGradeLevel" runat="server" DataSourceID="datasrcGradeLevel" DataTextField="Level"
                        DataValueField="GL_UID">
                    </asp:DropDownList><asp:SqlDataSource ID="datasrcGradeLevel" runat="server" ConnectionString="<%$ ConnectionStrings:CR_GradeBookConnectionString %>"
                        SelectCommand="GetGradeLevels" SelectCommandType="StoredProcedure"></asp:SqlDataSource>
                </td>
            </tr>
        </table>
        <span class="spanButtonRow">
            <asp:Button ID="btnAdd" runat="server" Text="Add" CssClass="btnButton" OnClick="btnAdd_Click" />
            <asp:Button ID="btnUpdate" runat="server" Text="Update" CssClass="btnButton" OnClick="btnUpdate_Click" />
            
        </span>
        <div>
            <div class="divLabel">
                Status:</div>
            <asp:Label ID="lblStatus" runat="server" Text="Enter a new student or edit an existing one" CssClass="lblStatus"></asp:Label>&nbsp;
        </div>
    </div>
</asp:Content>

Sample of code-file that does not work now:

protected void btnAdd_Click(object sender, EventArgs e)
    {
        this.datasrcStudent.Insert();
    }

Code from master page:

<%@ Master Language="C#" AutoEventWireup="true" CodeFile="GradeBook.master.cs" Inherits="GradeBook" %>

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

<html xmlns="[URL unfurl="true"]http://www.w3.org/1999/xhtml"[/URL] >
<head runat="server">
    <title>Untitled Page</title>
    <link href="~/styles/Styles.css" rel="stylesheet" type="text/css" />
</head>
<body>
    <form id="form1" runat="server">
    <div id="header">
        <img src="~/images/cedar_ridge_logo_small.jpg" alt="logo" id="imgHeader" />
        <div id="txtHeader">
            <h1>Grade Book</h1>
            <span>
                <a class="globallinks" href="~/Index.aspx">Home</a>
                <a class="globallinks" href="~/Students.aspx">Students</a>
                <a class="globallinks" href="~/Courses.aspx">Courses</a>
                <a class="globallinks" href="~/Classes.aspx">Classes</a>
                <a class="globallinks" href="~/Assignments.aspx">Assignments</a>
                <a class="globallinks" href="~/ClassRoster.aspx">Class Roster</a>
                <a class="globallinks" href="~/Scores.aspx">Assignment Scores</a>
            </span>
        </div><br /><hr />
    </div>
        <asp:contentplaceholder id="main" runat="server">
        </asp:contentplaceholder>
    <div id="footer">
        <hr />
        <span>Cedar Ridge Ministries, 2006</span>
    </div>
    </form>
</body>
</html>

Jason

http://www.catotek.com