Dim lst As List(of String) = DataTables("表A").GetValues("第三列")
Dim lst2 As new List(of String)
For Each s As String In lst
Dim dr As DataRow = DataTables("表A").Find("第三列='" & s & "'","第一列 desc")
If dr IsNot Nothing AndAlso dr("第四列")=0 Then Continue For
lst2.Add(s)
Next
e.Form.Controls("ComboBox1").ComboList = String.Join("|",lst2.ToArray)