passing dropdown value to update parameter for ASP.Net Gridview - asp.net

Question

I have a gridview that, when in edit mode, I use a dropdown to load all provinces, however, when I change the province and click update, my page crashes...I'm not sending the province parameter to the gridview's updateparameters properly...here's my code, someone please help..
<asp:GridView runat="server" ID="gvUsers" DataKeyNames="UserID" BackColor="#eeeeee" Width="85%"
HorizontalAlign="Center"
Font-Bold="False" Font-Names="Verdana"
Font-Size="10pt" AutoGenerateColumns="False"
OnRowDataBound="gvUsers_RowDataBound"
OnRowDeleting="gvUsers_RowDeleting" >
<HeaderStyle BackColor="#904601" ForeColor="White"
Font-Bold="True" HorizontalAlign="Left" />
<SelectedRowStyle BackColor="Yellow" />
<AlternatingRowStyle BackColor="White" Font-Bold="false" />
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:LinkButton ID="LinkButton2"
CommandArgument='<%# Eval("UserID") %>'
CommandName="Select" runat="server">
Select</asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="UserID" Visible="False" />
<asp:TemplateField HeaderText="Name">
<ItemTemplate>
<asp:Label ID="Label1" runat="server" Text='<%# Bind("FirstName") %>'></asp:Label>
<asp:Label ID="Label2" runat="server" Text='<%# Eval("LastName") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Delete?">
<ItemTemplate>
<asp:LinkButton ID="LinkButton1"
CommandArgument='<%# Eval("UserID") %>'
CommandName="Delete" runat="server">
Delete</asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
</Columns>
<RowStyle HorizontalAlign="Left" />
</asp:GridView><br /><br />
<asp:DetailsView runat="server" ID="dvUser" DataSourceID="SqlDataSource1" AutoGenerateRows="False" Width="85%" DataKeyNames="UserID"
HorizontalAlign="Center" AutoGenerateInsertButton="True" AutoGenerateEditButton="True" OnItemInserted="dvUsers_ItemInserted" >
<Fields>
<asp:BoundField DataField="UserID" Visible="False" />
<asp:BoundField DataField="FirstName" HeaderText="FirstName" SortExpression="FirstName" />
<asp:BoundField DataField="LastName" HeaderText="LastName" SortExpression="LastName" />
<asp:BoundField DataField="UserName" HeaderText="UserName" ReadOnly="true" SortExpression="UserName" />
<asp:TemplateField HeaderText="Password">
<ItemTemplate>
<asp:Label runat="server" ID="lblPassword" Text="●●●●●●●●●"></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox runat="server" ID="txtPassword" TextMode="Password" Text='<%# Bind("Password") %>'>
</asp:TextBox>
</EditItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Birthdate" SortExpression="Birthdate">
<EditItemTemplate>
<asp:TextBox runat="server" ID="Birthdate" Text='<%# Bind("Birthdate") %>' ></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label runat="Server" ID="lblBirthdate" Text='<%# Bind("Birthdate") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="Address" HeaderText="Address" SortExpression="Address" />
<asp:BoundField DataField="Apt" HeaderText="Apt" SortExpression="Apt" />
<asp:BoundField DataField="City" HeaderText="City" SortExpression="City" />
<asp:TemplateField HeaderText="Province">
<ItemTemplate>
<asp:Label runat="server" ID="lblProvince" Text='<%# Eval("ProvName") %>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:DropDownList runat="server" ID="ddlProvince" DataValueField="ProvinceID" DataSourceID="SqlDataSource2" DataTextField="Province"></asp:DropDownList>
</EditItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="PostalCode" HeaderText="PostalCode" SortExpression="PostalCode" />
<asp:BoundField DataField="PhoneNum" HeaderText="PhoneNum" SortExpression="PhoneNum" />
<asp:BoundField DataField="Email" HeaderText="Email" SortExpression="Email" />
<asp:CheckBoxField DataField="ynAdminUser" HeaderText="ynAdminUser" SortExpression="ynAdminUser" />
</Fields>
</asp:DetailsView>
<asp:SqlDataSource ID="SqlDataSource2"
runat="server" ConnectionString="<%$ ConnectionStrings:ConnectionString %>"
SelectCommand="SELECT ProvinceID, Province FROM tblProvince"></asp:SqlDataSource>
<asp:SqlDataSource ID="SqlDataSource1"
runat="server" ConnectionString="<%$ ConnectionStrings:ConnectionString %>"
SelectCommand="SELECT a.UserID, a.FirstName, a.LastName, a.UserName, a.Password, a.Birthdate, a.Address, a.Apt, a.City, a.Province, b.Province as 'ProvName',
a.PostalCode, a.PhoneNum, a.Email, a.ynAdminUser
FROM tblUser a
INNER JOIN tblProvince B ON A.Province = B.ProvinceID
WHERE (a.UserID = #UserID) AND (a.ynDelete = 0)"
InsertCommand="INSERT INTO tblUser(FirstName, LastName, UserName, Password, Birthdate, Address, Apt, City, Province, PostalCode, Email, PhoneNum, ynAdminUser, ynDelete) VALUES (#FirstName, #LastName, #UserName, #Password, #Birthdate, #Address, #Apt, #City, #Province, #PostalCode, #Email, #PhoneNum, #ynAdminUser, 0)"
UpdateCommand="UPDATE tblUser SET FirstName = #FirstName, LastName = #LastName, Birthdate = #Birthdate, Address = #Address, Apt = #Apt, City = #City, Province = #Province, PostalCode = #PostalCode, PhoneNum = #PhoneNum, Email = #Email, ynAdminUser = #ynAdminUser WHERE (UserID = #UserID)">
<SelectParameters>
<asp:ControlParameter ControlID="gvUsers" Name="UserID" PropertyName="SelectedValue" Type="Int32" />
</SelectParameters>
<UpdateParameters>
<asp:Parameter Name="FirstName" Type="String" />
<asp:Parameter Name="LastName" Type="String" />
<asp:Parameter DbType="DateTime" Name="BirthDate" />
<asp:Parameter Name="Address" Type="String" />
<asp:Parameter Name="Apt" Type="String" />
<asp:Parameter Name="City" Type="String" />
<asp:ControlParameter Name="Province" ControlID="ddlProvince" PropertyName="SelectedValue" Type="Int32" />
<asp:Parameter Name="PhoneNum" Type="String" />
<asp:Parameter Name="Email" Type="String" />
<asp:Parameter Name="ynAdminUser" Type="Boolean" />
<asp:Parameter Name="UserID" Type="Int32" />
</UpdateParameters>
<InsertParameters>
<asp:Parameter Name="FirstName" Type="String" />
<asp:Parameter Name="LastName" Type="String" />
<asp:Parameter Name="UserName" Type="String" />
<asp:Parameter Name="Password" Type="String" />
<asp:Parameter DbType="DateTime" Name="Birthdate" />
<asp:Parameter Name="Address" Type="String" />
<asp:Parameter Name="Apt" Type="String" />
<asp:Parameter Name="City" Type="String" />
<asp:Parameter Name="Province" Type="Int32" />
<asp:Parameter Name="PostalCode" Type="String" />
<asp:Parameter Name="Email" Type="String" />
<asp:Parameter Name="PhoneNum" Type="String" />
<asp:Parameter Name="ynAdminUser" Type="Boolean" />
</InsertParameters>
</asp:SqlDataSource>

Answer 1

You don't need the control binding:
<asp:ControlParameter Name="Province" ControlID="ddlProvince" PropertyName="SelectedValue" Type="Int32" />
Instead, use a regualar parameter like your others and add the following binding to your drop-down list for the edit mode of the gridview:
SelectedValue=<%#Bind("Province")%>

Answer 2

I realize this is a really old question, and I hope you found your answer.
Looking at your markup, though, I want to say your connection strings were never filled out:
runat="server" ConnectionString="<%$ ConnectionStrings:ConnectionString %>"
I am not the strongest when it comes to ASP.NET databinding in the markup code, but I am pretty sure your connection string needs to point to an actual string name in your web.Config file's ConnectionStrings section:
<connectionStrings>
<clear />
<add name="Mark1" connectionString="Data Source=localhost;Initial Catalog=Table1;Integrated Security=True;" providerName="System.Data.SqlClient" />
</connectionStrings>
Use whatever your actual connection string is, though.
Now, your markup should be written as:
runat="server" ConnectionString="<%$ ConnectionStrings:Mark1 %>"
Again, I'm new to this. I found this only while trying to search for ways to solve my own problems.
If this is wrong (possible), someone just let me know what I did wrong and I'll delete it.