主题：帮忙看一段代码，懂的指点一下，谢谢！

帮忙看一段代码，懂的指点一下，谢谢！

代码如下

Dim txt As String = e.Form.Controls("TextBox1").Text
Dim tbl As Table = Tables("窗口4_Table1")
   tbl.filter=""
If txt = "" Then
    tbl.Filter = ""
Else
    txt = "'*" & txt & "*'"
    tbl.Filter = ("pfullname Like " & txt & " Or Standard Like " & txt & " Or Unit1 Like " & txt )
End If

我想把他改成 tbl.filter=(" pfullname Like " & txt & " Or Standard Like " & txt & " Or Unit1 Like " & txt") and (leveal=2 and deleted=0 and isstop=0)

具体规范的方法怎么写？我尝试过很多方法都不对。

懂的指点一下，谢谢！