主题：[求助]更新SQL数据问题

Dim TimingNumber As String = e.Form.Controls("TimingNumber").Value
Dim UserName As String = e.Form.Controls("UserName").Value
Dim UserGroup As String  = e.Form.Controls("UserGroup").Value
Dim PassWord As String = e.Form.Controls("PassWord").Value
Dim Post As String = e.Form.Controls("Post").Value
Dim Position As String = e.Form.Controls("Position").Value
Dim Authority As WinForm.CheckBox
Authority = e.Form.Controls("Authority")
Dim OldUserName As String
If e.Form.Controls("PassWord1").Value <> e.Form.Controls("PassWord").Value Then
 Messagebox.show("請輸入登錄工號!","提示",MessageBoxButtons.OK,MessageBoxIcon.Information)
End If
Dim cmd As New SQLCommand
Dim Parts() As String = e.Form.Text.Split("-")
OldUserName =  Parts(Parts.Length -1)
cmd.C
If TimingNumber = "" Then
    Messagebox.show("請輸入登錄工號!","提示",MessageBoxButtons.OK,MessageBoxIcon.Information)
    Return
End If
Dim F As Integer
If Authority.Checked = False Then
   F = 0
  Else
   F = 1
End If
cmd.CommandText = "Update {用戶表} Set [工號] =  '" & TimingNumber & "', [用戶名] = '" & UserName & "',[部門] = '" & UserGroup  & "', [職務] = '" & Post & "', [職位] = '" & Position & "', [特殊權限] = '" & F & "', [密碼] = '" & Password & "' Where [用戶名]= '" & OldUserName & "'"
If cmd.ExecuteNonQuery = 1 Then '返回1表示更改成功
   Messagebox.show("更改用戶信息成功!","提示",MessageBoxButtons.OK,MessageBoxIcon.Information)
    If Forms("用戶管理").Opened Then
        With Forms("用戶管理").Controls("ListBox1")
            .Items(.SelectedIndex) = UserName
        End With
    End If
    e.Form.Close
  Else
    Messagebox.show("更改用戶失敗!","提示",MessageBoxButtons.OK,MessageBoxIcon.Information)
End If

总是更改用户失败，不知道哪里出问题，请高手帮忙看看