Dim cmd As New SQLCommand
Dim dt As DataTable
cmd.C
cmd.CommandText = "SELECT DISTINCT * Fro m {面料规格表}"
dt = cmd.ExecuteReader(True)
Dim st As WinForm.ComboBox = Forms("窗口1").Controls("ComboBox1")
Dim su As WinForm.ComboBox = Forms("窗口2").Controls("ComboBox1")
Dim sr As WinForm.ComboBox = Forms("窗口2").Controls("ComboBox2")
Dim tv As WinForm.TreeView
tv = e.Form.Controls("TreeView1")
tv.BuildTree("面料规格表", "规格类别|名称|规格", "[规格类别] = '" & st.Value & "' ", "规格类别,排序码")
请问这个怎么写