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dominicwong
 asked on

How to find a deleted row from two DataTables in C#

I have two DataTables as follows.
The 3rd row is removed from the Table 1.
I would like to do a diff of the two tables, and get an answer to tell me that the row had been deleted.
I tried with the following code but it doesn't work. The result it gave me was 11 rows unchanged.

Any idea please. Thanks.

            table1.AcceptChanges();
            table2.AcceptChanges();
            table1.Merge(table2, true);

            if(added != null)
                Debug.WriteLine("added = " + added.Rows.Count);
            if (deleted != null)
                Debug.WriteLine("deleted = " + deleted.Rows.Count);
            if (detached != null)
                Debug.WriteLine("detached = " + detached.Rows.Count);
            if (modified != null)
                Debug.WriteLine("modified = " + modified.Rows.Count);
            if (unchanged != null)
                Debug.WriteLine("unchanged = " + unchanged.Rows.Count);

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 Table1
          Key1                Key2                 Key3                Key4                Key5               Key6               Key7
    2063620735   2107319875   1418390997    270727583    270727583    652640566    369246503
    1630856750    515371590    416266794   2014872019   2014872019    532186611    504554590
     971040548   2107319875   1418390997   1037345008   1037345008    652640566    369246503  <-- Deleted
    1604012077   2107319875    416266794   2014872019   2014872019    532186611    369246503
    1604012077    515371590   1418390997    270727583   1037345008    652640566    369246503
    2063620735    515371590    416266794    421288522   2014872019    532186611    369246503
 
  Table2
          Key1                Key2                 Key3                Key4                Key5               Key6               Key7
    2063620735   2107319875   1418390997    270727583    270727583    652640566    369246503
    1630856750    515371590    416266794   2014872019   2014872019    532186611    504554590
    1604012077   2107319875    416266794   2014872019   2014872019    532186611    369246503
    1604012077    515371590   1418390997    270727583   1037345008    652640566    369246503
    2063620735    515371590    416266794    421288522   2014872019    532186611    369246503
C#

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Last Comment
Frank Helk

8/22/2022 - Mon
SOLUTION
Naitik Gamit

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dominicwong

ASKER
Thanks Naitik.
As to your suggestion to find the the "removed_keys" by using only "key1", could I make use of all the columns in the table?
My example might be a bad one. For example, I might not know in advance which key is different.

Also I would like to be able to tell whether the 2nd table had added, deleted, modified, etc rows.
ASKER CERTIFIED SOLUTION
Naitik Gamit

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dominicwong

ASKER
Thanks Naitik. It works.
Frank Helk

No comment has been added to this question in more than 21 days, so it is now classified as abandoned.

I have recommended this question be closed as follows:

Split:
-- Naitik Gamit (https:#a42081170)
-- Naitik Gamit (https:#a42079571)


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