ช่วยทีคับผู้รู้ Add ข้อมุลจาก VB.NET ลง SQL Server + Parameters ไม่ได้คับ

Option Explicit On
Option Strict On
Imports System.Text
Imports System.Data
Imports System.Data.SqlClient

Public Class Form1
    Dim Conn As SqlConnection
    Dim com As SqlCommand
    Dim tr As SqlTransaction

    Dim sb As StringBuilder

    Private Sub Form1_FormClosed(ByVal sender As Object, ByVal e As System.Windows.Forms.FormClosedEventArgs) Handles Me.FormClosed
        If Conn IsNot Nothing Then
            Conn.Close()
        End If
    End Sub

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Dim strConn As String
        strConn = DBConnString.strConn

        Conn = New SqlConnection
        With Conn
            If .State = ConnectionState.Open Then .Close()
            .ConnectionString = strConn
            .Open()
        End With
    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

        If MessageBox.Show("คุณต้องการเพิ่มใหม่ใช่หรือไม่ !!!", "คำยืนยัน", MessageBoxButtons.YesNo, MessageBoxIcon.Question) = Windows.Forms.DialogResult.Yes Then
            tr = Conn.BeginTransaction()

            sb = New StringBuilder()

            sb.Append("INSERT INTO Customer (CustomerID,CustomerName,CustomerLastname,address,postal,Phone,Mail,TypeCar,Brand,Model,Licenseplate,Color,NumberEngine,NumberBody)")
            sb.Append(" VALUES (@CustomerID,@CustomerName,@CustomerLastname,@address,@postal,@Phone,@Mail,@TypeCar,@Brand,@Model,@Licenseplate,@Color,@NumberEngine,@NumberBody)")
            Dim sqlAdd As String
            sqlAdd = sb.ToString()

            With com
                .CommandText = sqlAdd
                .CommandType = CommandType.Text
                .Connection = Conn
                .Transaction = tr
                .Parameters.Clear()

                .Parameters.Add("@CustomerID", SqlDbType.Char).Value = TextBox1.Text.Trim
                .Parameters.Add("@CustomerName", SqlDbType.NVarChar).Value = TextBox2.Text.Trim
                .Parameters.Add("@CustomerLastname", SqlDbType.NVarChar).Value = TextBox3.Text.Trim
                .Parameters.Add("@address", SqlDbType.NVarChar).Value = TextBox4.Text.Trim
                .Parameters.Add("@postal", SqlDbType.Char).Value = TextBox5.Text.Trim
                .Parameters.Add("@Phone", SqlDbType.Char).Value = TextBox6.Text.Trim
                .Parameters.Add("@Mail", SqlDbType.NVarChar).Value = TextBox7.Text.Trim
                .Parameters.Add("@TypeCar", SqlDbType.NVarChar).Value = TextBox8.Text.Trim
                .Parameters.Add("@Brand", SqlDbType.NVarChar).Value = TextBox9.Text.Trim
                .Parameters.Add("@Model", SqlDbType.NVarChar).Value = TextBox10.Text.Trim
                .Parameters.Add("@Licenseplate", SqlDbType.NVarChar).Value = TextBox11.Text.Trim
                .Parameters.Add("@Color", SqlDbType.NVarChar).Value = TextBox12.Text.Trim
                .Parameters.Add("@NumberEngine", SqlDbType.NVarChar).Value = TextBox13.Text.Trim
                .Parameters.Add("@NumberBody", SqlDbType.NVarChar).Value = TextBox14.Text.Trim

                .ExecuteNonQuery()
            End With
            tr.Commit()
            MessageBox.Show("เพิ่มใหม่เรียบร้อย", "คำยืนยัน", MessageBoxButtons.OK, MessageBoxIcon.Information)
        End If
        TextBox1.Focus()
    End Sub
End Class