2 Gridview error on getting data executereader error

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ASP.NET

Hello Guys, first ive got an error saying"There is already an open DataReader associated with this Command which must be closed first"
So I change my code I close the first reader soo here is my code now

If (IsPostBack = False) Then
            Dim strSQL As String
            Dim strSQL2 As String
            Dim SQLreader As SqlClient.SqlDataReader
            Dim connection As SqlClient.SqlConnection = New SqlClient.SqlConnection("Data Source=ML0003135586;Initial Catalog=TestSQL;Integrated Security=True")
            strSQL = "SELECT [ID], [CourseTitle], [CourseCode], [Objectives], [Duration] FROM [tblTrainingPlan]WHERE ([Category] = @Category)"

            connection.Open()
            Dim myCommand As SqlClient.SqlCommand = New SqlClient.SqlCommand(strSQL, connection)
            myCommand.Parameters.AddWithValue("@Category", lblGEE.Text)
            SQLreader = myCommand.ExecuteReader()
            SQLreader = GridView1.DataSource
            GridView1.DataBind()
            SQLreader.Close()
            strSQL2 = "SELECT [ID], [CourseTitle], [CourseCode], [Objectives], [Duration] FROM [tblTrainingPlan]WHERE ([Category] = @Category)"
            Dim myCommand2 As SqlClient.SqlCommand = New SqlClient.SqlCommand(strSQL2, connection)
            myCommand2.Parameters.AddWithValue("@Category", lblCross.Text)
            TPCross.DataSource = myCommand2.ExecuteReader()
            TPCross.DataBind()
            connection.Close()
            connection.Close()

        End If

My problem is when i run it new error occured sayingObject reference not set to an instance of an object.
Help plss I dont know where ive got wrong.. Keep banging my head just to solved this problem.

Thanks in advance and more programming to come ^_^