User Control And Code Behind

I am working with Telerik's new rad grid that is helping us speed up our development process. I also have a VB code behind page for the aspx form that does my sql database connection and statements. From the aspx form I also have a user control. The user control allows me to format my edit area within the rad grid in html and asp.net which allows me full control. This user control is an ascx page referenced in my aspx form. I know this is getting confusing so let me get to the point. My control page has an button with CommandName="Update". The vb codebehind for this page looks like:

Imports System
Imports System.Data
Imports System.Collections
Imports System.Web.UI
Imports System.Data.SqlClient
Imports Telerik.QuickStart
Imports Telerik.WebControls
Partial Class UserDetails
Inherits System.Web.UI.UserControl
Sub Btn_Update(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnUpdate.Click
Dim MySqlConnection As New SqlConnection("Data Source=")
Dim UserAdapter As SqlDataAdapter = New SqlDataAdapter("SELECT * FROM WebUsers", MySqlConnection)Dim UserDT As DataTable = New DataTable()
UserAdapter.UpdateCommand = New SqlCommand("UPDATE [Users] SET [UserName] = @OldUserName, [Comments] = @OldComments WHERE [UserID] = @OldUserID", MySqlConnection)
UserAdapter.UpdateCommand.Parameters.Add("@UserID", SqlDbType.Int, 5, "UserID")
UserAdapter.UpdateCommand.Parameters.Add("@OldUserName", SqlDbType.Char, 5, "UserName")
UserAdapter.UpdateCommand.Parameters.Add("@OldComments", SqlDbType.Char, 5, "Comments")
UserAdapter.Fill(UserDT)
MySqlConnection.Close()
Try
MySqlConnection.Open()
UserAdapter.Update(UserDT)
Catch ex As Exception
Finally
MySqlConnection.Close()
End Try
End Sub
End Class

The line of code for the button is:

<asp:button id="btnUpdate" text="Update" runat="server" CommandName="Update" OnClick="Btn_Update"></asp:button>

I know there is some simple logic error I have. The page isn't erroring, and there doesn't look like a problem but we aren't able to update the database. I know the button click event gets to the code because we plugged a msg box in there and it appeared, twice I might add, which i don't know about either. Can anyone help us make this darn thing update??? What logic are we missing?

Thanks!!!