标题：求助代码

判别A表某行某列的值是否符B表某行某列的代码如何写？请狐友们帮助解决

For Each dr as DataRow in DataTables("Zstb").DataRows
    For Each dr1 as Datarow in DataTables("Zszy").Datarows
        For Each dc as Datacol in DataTables("Zszy").Datacols
            if dr(dc.name) = dr1(dc.name) then
                Return
            else
                dr(dc.name) = "错误"
            end if
        next
    next
上述代码正确吗？

For Each dr as DataRow in DataTables("Zstb").DataRows
    For Each dr1 as Datarow in DataTables("Zszy").Datarows
        For Each dc as Datacol in DataTables("Zszy").Datacols
            dr(dc.name) = "错误"
            if dr(dc.name) = dr1(dc.name) then
                dr(dc.name) = ""
            end if
        next
    next
Next

老六我是正确的不修改他，错误的提示？

For Each dr as DataRow in DataTables("Zstb").DataRows
    For Each dr1 as Datarow in DataTables("Zszy").Datarows
        For Each dc as Datacol in DataTables("Zszy").Datacols
           
            if dr(dc.name) = dr1(dc.name) then
                exit for
            else
                dr(dc.name) = "错误"
            end if
        next
    next
Next
上述代码是判别表ZSTB的某列的值等于表ZSZY某列的值时，执行下一循环，不等时在ZSTB的某列显示错误

请帮助解决，我硬是想不出来道理。

For Each dr as DataRow in DataTables("Zstb").DataRows
    For Each dr1 as Datarow in DataTables("Zszy").Datarows
        For Each dc as Datacol in DataTables("Zszy").Datacols
           
            if dr(dc.name) <>dr1(dc.name) then
                dr(dc.name) = "错误"
            end if
        next
    next
Next

yangming不行

怎么不行，说清楚