problem with cmd.ExecuteScalar() in asp.net

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ASP.NET

Protected Sub btnSubmit_Click(ByVal sender As Object, ByVal e As System.EventArgs)
        Dim connection As SqlConnection = Nothing
        Try
            Dim img As FileUpload = CType(QuestionUp, FileUpload)
            Dim imgByte As Byte() = Nothing
            If img.HasFile AndAlso Not img.PostedFile Is Nothing Then
                'To create a PostedFile
                Dim File As HttpPostedFile = QuestionUp.PostedFile
                'Create byte Array with file len
                imgByte = New Byte(File.ContentLength - 1) {}
                'force the control to load data in array
                File.InputStream.Read(imgByte, 0, File.ContentLength)
            End If
            ' Insert the employee name and image into db
            Dim conn As String = ConfigurationManager.ConnectionStrings("constr").ConnectionString
            connection = New SqlConnection(conn)

            connection.Open()

            Dim sql As String = "INSERT INTO QN_QUESTION_MAST(QUES_CODE,Ques_ImageData) VALUES(@QUES_CODE, @Ques_ImageData) SELECT @@IDENTITY"

            Dim cmd As SqlCommand = New SqlCommand(sql, connection)
            cmd.Parameters.AddWithValue("@QUES_CODE", txtQuestionCode.Text)
            cmd.Parameters.AddWithValue("@Ques_ImageData", imgByte)
            Dim id As Integer = Convert.ToInt32(cmd.ExecuteScalar())
            lblMsg.Text = String.Format("QUES_CODE is {0}", id)
            Image2.ImageUrl = "~/ShowImage.ashx?id=" & id
        Catch
            lblMsg.Text = "There was an error"
        Finally
            connection.Close()
        End Try
    End Sub

** I am getting the 'id' value as'_page' when debugging and not the ques_code int value,but record is inserting well,& the query in running ok in sql, please help me...