插入执行两次，VB

Question

我的insert语句总是执行两次，这是我的代码：

Private Sub NewEmployee()
    Dim MS As New MemoryStream
    Dim Images() As Byte

    If (pbEmpPhoto.Image IsNot Nothing) Then
        pbEmpPhoto.Image.Save(MS, pbEmpPhoto.Image.RawFormat)
        Images = MS.GetBuffer
        MS.Close()
    End If


    ' Adds Parameters
    Access.AddParam("@empid", tbEmpID.Text)
    Access.AddParam("@lname", tbLastName.Text)
    Access.AddParam("@fname", tbFirstName.Text)
    Access.AddParam("@address", tbAddress.Text)
    Access.AddParam("@contact", tbContact.Text)
    Access.AddParam("@dept", cbDept.SelectedItem)
    Access.AddParam("@position", cbPosition.SelectedItem)
    Access.AddParam("@emppic", IIf(pbEmpPhoto.Image IsNot Nothing, Images, DBNull.Value))

    ' Execute Insert Command
    Access.ExecQuery("INSERT INTO EmployeeInfo (EmployeeID,Fname,Lname,Address,[Contact],Department,[Position],EmployeePic) VALUES (@empid,@fname,@lname,@address,@contact,@position,@dept,@emppic); ")

    ' Reports And Aborts on Errors
    If Not String.IsNullOrEmpty(Access.Exception) Then MsgBox(Access.Exception) : Exit Sub
    ' Success Message
    MessageBox.Show("Registration Successful!", "New Employee", MessageBoxButtons.OK, MessageBoxIcon.Asterisk)


    RG.RefreshGrid()
    pbEmpPhoto.Image = Nothing
    Exit Sub
    Me.Close()


End Sub

Access来自我创建的类，这里是执行sub：

的地方

Private Sub btnAdd_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnAdd.Click
    NewEmployee()
End Sub

我该如何解决这类问题？请帮我。先感谢您。