如何修改以下代码从后台提取不重复数据填充
Dim A As New Filler
DataTables("C").DataRows.Clear() '清除原有数据
A.SourceTable = DataTables("材料期初")
A.SourceCols = "材料代码,颜色"
A.DataTable = DataTables("材料库存")
A.DataCols = "材料代码,颜色"
A.ExcludeExistValue = True '排除接收表中已经存在的值
A.Fill()
A = New Filler
A.SourceTable = DataTables("材料入库")
A.SourceCols = "材料代码,颜色"
A.DataTable = DataTables("材料库存")
A.DataCols = "材料代码,颜色"
A.ExcludeExistValue = True
A.Fill()
A = New Filler
A.SourceTable = DataTables("材料出库")
A.SourceCols = "材料代码,颜色"
A.DataTable = DataTables("材料库存")
A.DataCols = "材料代码,颜色"
A.ExcludeExistValue = True
A.Fill()