Stored procedure's parameter was not supplied in aspx.vb - asp.net

Question

I want to display data in a gridview using a SQL Server stored procedure. The interface should include two textboxes for two parameters, one button, and a gridview. The data will display after all parameters are filled out and the button is clicked. But I got an error saying
'Procedure or function 'uspGetBillOfMaterials' expects parameter '#StartProductID', which was not supplied.'
Edit 1: I found out that I called parameter StartProducID instead of StartProductID. Thank you guys for helping me with this. I fixed the problem.
Now I get a new error:
Both DataSource and DataSourceID are defined on 'GridView1'. Remove one definition.
Hope you can help me figure out where is my problem and the way to fix it.
Thanks.
Edit 2: I figured out my problems and posted the answer below. Basically, I just deleted the last two rows in my code-behind and it worked.
Here is my code in ASP.NET:
Please enter StartedProduct <asp:TextBox ID="StartProductID" runat="server"></asp:TextBox>
<br />
Please enter Date <asp:TextBox ID="CheckDate" runat="server"></asp:TextBox>
<br />
<asp:Button ID="Button1" runat="server" Text="Search BOM" />
<br />
<asp:GridView ID="GridView1" runat="server" DataSourceID="TestProc" AutoGenerateColumns="True">
<Columns>
<asp:BoundField DataField="ProductAssemblyID" HeaderText="ProductAssemblyID" ReadOnly="True" SortExpression="ProductAssemblyID" />
<asp:BoundField DataField="ComponentID" HeaderText="ComponentID" ReadOnly="True" SortExpression="ComponentID" />
<asp:BoundField DataField="ComponentDesc" HeaderText="ComponentDesc" ReadOnly="True" SortExpression="ComponentDesc" />
<asp:BoundField DataField="TotalQuantity" HeaderText="TotalQuantity" ReadOnly="True" SortExpression="TotalQuantity" />
<asp:BoundField DataField="StandardCost" HeaderText="StandardCost" ReadOnly="True" SortExpression="StandardCost" />
<asp:BoundField DataField="ListPrice" HeaderText="ListPrice" ReadOnly="True" SortExpression="ListPrice" />
<asp:BoundField DataField="BOMLevel" HeaderText="BOMLevel" ReadOnly="True" SortExpression="BOMLevel" />
<asp:BoundField DataField="RecursionLevel" HeaderText="RecursionLevel" ReadOnly="True" SortExpression="RecursionLevel" />
</Columns>
</asp:GridView>
<asp:SqlDataSource ID="TestProc" runat="server"
ConnectionString="<%$ ConnectionStrings:AdventureWorks2014ConnectionString %>"
SelectCommand="uspGetBillOfMaterials"
SelectCommandType="StoredProcedure">
<SelectParameters>
<asp:ControlParameter ControlID="StartProductID" Name="StartProductID" PropertyName="Text" Type="Int32" />
<asp:ControlParameter ControlID="CheckDate" Name="CheckDate" PropertyName="Text" Type="DateTime" />
</SelectParameters>
</asp:SqlDataSource>
Here is my code-behind:
Public Class TestStoredProcedure
Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
End Sub
Protected Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim command As New SqlCommand()
Dim adapter As New SqlDataAdapter()
Dim ds As New DataSet()
Dim i As Integer = 0
Dim sql As String = Nothing
Dim connetionString As String = "Data Source=(local);Initial Catalog=AdventureWorks2014;Integrated Security=True"
Dim connection As New SqlConnection(connetionString)
connection.Open()
command.Connection = connection
command.CommandType = CommandType.StoredProcedure
command.CommandText = "uspGetBillOfMaterials"
command.Parameters.AddWithValue("StartProductID", StartProductID.Text)
command.Parameters.AddWithValue("#CheckDate", CheckDate.Text)
adapter = New SqlDataAdapter(command)
adapter.Fill(ds)
connection.Close()
GridView1.DataSource = ds.Tables(0)
GridView1.DataBind()
End Sub
End Class

Answer 1

I figured out my problems:
The first error was because of a wrong parameter's name. It should be "StartProductID" instead of "StartProducID".
The second error was because I defined the gridview in both C# code and Vb code. I deleted the last two rows in my code-behind and it worked. Here is the link that helped me solve my issue.
Thank you all.