ASP.NET DropDownList in FormView - asp.net

Question

Been working on an ASP.NET form, and struggling with one particular part. I'm using a SqlDataSource with an Insert function that points to a stored proc, with a few input parameters. I have a FormView set up. I would like for one of the form's input fields to be a DropDownList whose options are populated from a different SqlDataSource. For reference, here is the formview:
<asp:FormView runat="server" id="FormView1" DataSourceID="SqlDataSource1" DefaultMode="Insert">
<EditItemTemplate>
refund_ach:
<asp:CheckBox Checked='<%# Bind("ach") %>' runat="server" id="refund_achCheckBox" />
<br />
refund_dba_name:
<asp:TextBox Text='<%# Bind("dbaname") %>' runat="server" id="refund_dba_nameTextBox" />
<br />
refund_mid:
<asp:TextBox Text='<%# Bind("mid") %>' runat="server" id="refund_midTextBox" />
<br />
refund_description:
<asp:TextBox Text='<%# Bind("description") %>' runat="server" id="refund_descriptionTextBox" />
<br />
refund_amount:
<asp:TextBox Text='<%# Bind("amount") %>' runat="server" id="refund_amountTextBox" />
<br />
refund_type:
<asp:TextBox Text='<%# Bind("type") %>' runat="server" id="refund_typeTextBox" />
<br />
<asp:LinkButton runat="server" Text="Update" CommandName="Update" id="UpdateButton" CausesValidation="True" />
<asp:LinkButton runat="server" Text="Cancel" CommandName="Cancel" id="UpdateCancelButton" CausesValidation="False" />
</EditItemTemplate>
<InsertItemTemplate>
<asp:Table runat="server" id="Table1">
<asp:TableRow>
<asp:TableCell>ACH?:
</asp:TableCell>
<asp:TableCell><asp:CheckBox Checked='<%# Bind("ach") %>' runat="server" id="refund_achCheckBox" />
</asp:TableCell>
</asp:TableRow>
<asp:TableRow>
<asp:TableCell>DBA Name:
</asp:TableCell>
<asp:TableCell><asp:TextBox Text='<%# Bind("dbaname") %>' runat="server" id="refund_dba_nameTextBox" />
</asp:TableCell>
</asp:TableRow>
<asp:TableRow>
<asp:TableCell>MID:
</asp:TableCell>
<asp:TableCell><asp:TextBox Text='<%# Bind("mid") %>' runat="server" id="refund_midTextBox" />
</asp:TableCell>
</asp:TableRow>
<asp:TableRow>
<asp:TableCell>Description:
</asp:TableCell>
<asp:TableCell><asp:TextBox Text='<%# Bind("description") %>' runat="server" id="refund_descriptionTextBox" />
</asp:TableCell>
</asp:TableRow>
<asp:TableRow>
<asp:TableCell>Amount:
</asp:TableCell>
<asp:TableCell><asp:TextBox Text='<%# Bind("amount") %>' runat="server" id="refund_amountTextBox" />
</asp:TableCell>
</asp:TableRow>
<asp:TableRow>
<asp:TableCell>Type:
</asp:TableCell>
<asp:TableCell><asp:DropDownList DataSourceID="SqlDataSource2" SelectedValue='<%# Bind("type") %>' DataTextField="Reason" DataValueField="ID" runat="server" id="refund_typeTextBox" />
</asp:TableCell>
</asp:TableRow>
</asp:Table>
<asp:LinkButton runat="server" Text="Insert" CommandName="Insert" id="InsertButton" CausesValidation="True" />
<asp:LinkButton runat="server" Text="Cancel" CommandName="Cancel" id="InsertCancelButton" CausesValidation="False" />
</InsertItemTemplate>
<ItemTemplate>
refund_ach:
<asp:CheckBox Checked='<%# Bind("ach") %>' runat="server" id="refund_achCheckBox" Enabled="false" />
<br />
refund_dba_name:
<asp:Label Text='<%# Bind("dbaname") %>' runat="server" id="refund_dba_nameLabel" />
<br />
refund_mid:
<asp:Label Text='<%# Bind("mid") %>' runat="server" id="refund_midLabel" />
<br />
refund_description:
<asp:Label Text='<%# Bind("description") %>' runat="server" id="refund_descriptionLabel" />
<br />
refund_amount:
<asp:Label Text='<%# Bind("amount") %>' runat="server" id="refund_amountLabel" />
<br />
refund_type:
<asp:Label Text='<%# Bind("type") %>' runat="server" id="refund_typeLabel" />
<br />
</ItemTemplate>
</asp:FormView>
And here is the SqlDataSource:
<asp:SqlDataSource runat="server" id="SqlDataSource1" ProviderName="System.Data.SqlClient" ConnectionString="Data Source=myserver;Initial Catalog=mydatabase;Persist Security Info=True;User ID=mysvcaccount;Password=NOPE!;" SelectCommand="SELECT [refund_ach], [refund_dba_name], [refund_mid], [refund_description], [refund_amount], [refund_type] FROM [refund]" InsertCommand="EXEC usp_refund_insert #user, #ach, #dbaname, #mid, #description, #amount, #type">
<InsertParameters>
<asp:formparameter FormField="refund_achCheckBox" Name="ach" Type="Boolean" />
<asp:formparameter FormField="refund_amountTextBox" Name="amount" Type="Decimal" />
<asp:formparameter FormField="refund_dba_nameTextBox" Name="dbaname" Type="String" />
<asp:formparameter FormField="refund_descriptionTextBox" Name="description" Type="String" />
<asp:formparameter FormField="refund_midTextBox" Name="mid" Type="String" />
<asp:formparameter FormField="refund_typeTextBox" Name="type" Type="Int32" />
<asp:parameter DefaultValue="dfsdf" Name="user" Type="String" />
</InsertParameters>
</asp:SqlDataSource>
The data populates in the DDL just fine (from another SqlDataSource). All of the desired options come up. But when submitting the form, I get an error. I removed the DDL and hard-coded a value to that parameter, and it executed fine. I spent the last couple hours scouring the internet for a solution, finding tons, trying them, and not having any luck. I'm a DBA by trade, so .NET is not my forté, but it really doesn't seem like it should be this difficult to get a DDL to work like this.

Answer 1

WOW. After being very frustrated, I decided to start from scratch and give it another go, just to make sure I didn't miss anything. I built everything EXACTLY the same, MINUS all of the table elements... and it worked perfectly. I added the table elements back, stopped working. Removed them again: works.
No idea why, perhaps an .NET-proficient person can explain why, but it definitely solved my problem.