why is my dropdownlist in gridview not updated?

the new productname is written to the database, but databind will not show the new productname. See code

Thanks in advanced

<asp:TemplateField HeaderText="Product in Actie" Visible="True">
                    <ItemTemplate>
                          <asp:DropDownList ID="ddlProducts" runat="server" DataSourceID="AccessDataSourceProducts"
                        DataTextField="ProductName" DataValueField="ProductID" 
                        AppendDataBoundItems="True" Width="302px" TabIndex="9019"  
                      >
                         <asp:ListItem Text="" Value="" />
                    </asp:DropDownList>

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  Dim txProductNameManual As TextBox = GridView1.Rows(RowIndex).Cells(14).FindControl("txProductNameManual")

            If Len(txProductNameManual.Text) > 0 Then
                Dim sqlstring_product As String = "INSERT INTO Products " _
                                                    & "(ProductName) " _
                                                    & "VALUES (@ProductName)"

                Dim cmd_product As New OleDbCommand(sqlstring_product, con)
                cmd_product.CommandType = CommandType.Text
                cmd_product.Parameters.AddWithValue("@ProductName", Strings.Trim(txProductNameManual.Text))

                cmd_product.ExecuteNonQuery()
                cmd_product.Parameters.Clear()

                Dim ddlProducts As DropDownList = GridView1.Rows(RowIndex).Cells(13).FindControl("ddlProducts")
                ddlProducts.DataBind()

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Amien90Asked:
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dhawalsethConnect With a Mentor Commented:
It means you are binding the same control twice. I would recommend you remove the binding mentioned in the UI and populate your datasource through code from code behind.
The call from the UI is made when you first render your dropdown and anyway you have to bind it again after update.
Look in the code (RowDataBound event) and bind your control in there.. it is pretty similar to what will happen when you do a data binding from UI.
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Amien90Author Commented:
i think i need to do a datasource again before the databind? can't i just execute a select again on my DataSourceID?
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Amien90Author Commented:
or any other way to update my datasource? do i really need to create a new table, execute a select query and then a databind?
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dhawalsethCommented:
Dear Amien90,
You do need to do a 'update datasource' before doing a databind. Or else bind your drop down list on grid view row databound. Whenever your grid view will reload, which i believe will happen when a new entry is made in the db, the rows will be recreated and drop down will bind with the help of your code.

Mark as answer if helped.
Enjoy!!
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Amien90Author Commented:
Thanks for your reply.

"You do need to do a 'update datasource' before doing a databind. "

how can i do this? whats the syntax, cant find it.
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dhawalsethCommented:
Use your sql query used to initially populate the drop down. Replace your dropdown.databind with the code below:

dropdown.Datasource = (your datasource object);
//set data text, and data value here.
dropdown.Databind();

Mark as answer if helped.
Enjoy!!
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Amien90Author Commented:
This :  

 Dim ddlProducts As DropDownList = GridView1.Rows(RowIndex).Cells(13).FindControl("ddlProducts")

ddlProducts.DataSource = AccessDataSourceProducts
ddlProducts.DataBind()

gives me this error:

Both DataSource and DataSourceID are defined on 'ddlProducts'.  Remove one definition.

  <asp:DropDownList ID="ddlProducts" runat="server" DataSourceID="AccessDataSourceProducts"
                        DataTextField="ProductName" DataValueField="ProductID" 
                        AppendDataBoundItems="True" Width="302px" TabIndex="9019"  

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Amien90Author Commented:
Fixed!
 Dim txProductNameManual As TextBox = GridView1.Rows(RowIndex).Cells(14).FindControl("txProductNameManual")

            If Len(txProductNameManual.Text) > 0 Then
                Dim sqlstring_product As String = "INSERT INTO Products " _
                                                    & "(ProductName) " _
                                                    & "VALUES (@ProductName)"

                Dim cmd_product As New OleDbCommand(sqlstring_product, con)
                cmd_product.CommandType = CommandType.Text
                cmd_product.Parameters.AddWithValue("@ProductName", Strings.Trim(txProductNameManual.Text))

                cmd_product.ExecuteNonQuery()
                cmd_product.Parameters.Clear()

                Dim cmd As New OleDb.OleDbCommand("SELECT DISTINCT * FROM [Products] ORDER BY ProductName ", con)

                Dim ddlProducts As DropDownList = CType(GridView1.Rows(RowIndex).Cells(13).FindControl("ddlProducts"), DropDownList)

                Dim da As New OleDbDataAdapter(cmd)

                Dim ds As New DataSet()
                da.Fill(ds)

                ddlProducts.DataTextField = ds.Tables(0).Columns("ProductName").ToString()
                ddlProducts.DataValueField = ds.Tables(0).Columns("ProductID").ToString()

                ddlProducts.DataSource = ds.Tables(0)
                ddlProducts.DataBind()

                ds.Dispose()

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