主题：新增窗口问题

参考代码

Dim bm As String = e.Form.controls("textbox1").text
Dim xm As String = e.Form.controls("textbox2").text
Dim IPdz As String = e.Form.controls("textbox3").text
If bm = Nothing Then
    MessageBox.Show("部门未输入!","提示")
    Return
   
ElseIf xm = Nothing Then
    MessageBox.Show("姓名未输入!","提示")
    Return
ElseIf IPdz = Nothing Then
    MessageBox.Show("IP地址未输入!","提示")
    Return
   
End If