WebJan 11, 2014 · You can use Merge Method The Merge method is used to merge two DataTable objects that have largely similar schemas. A merge is typically used on a client application to incorporate the latest changes from a data source into an existing DataTable. WebJul 23, 2012 · How to merge two DataTables by primary key and foreign key (right join)? Ask Question Asked 10 years, 8 months ago Modified 10 years, 8 months ago Viewed 4k times 2 Is there a way, to merge two dataTables table1 and table2 by different keys? Want to do dataTable.Merge by t1 PK_id and t2 ParentId. Is this possible if ParentId is not a …
marking existing column as primary key in datatable
WebWhen merging a new source DataTable into the target, any source rows with a DataRowState value of Unchanged, Modified, or Deleted, is matched to target rows with the same primary key values. Source rows with a DataRowState value of Added are matched to new target rows with the same primary key values as the new source rows. WebMar 20, 2013 · I've also tried joining the tables by adding primary keys and doing a merge, but how do I then choose which column in dt2 to overwrite which one in dt1? DataTable join = new DataTable ("joined"); join = dt1.Copy (); join.Merge (dt2, false, MissingSchemaAction.Add); join.AcceptChanges (); I'm using VS2012. c# linq datatable … bohremulsion flasche
Linq merging DataTable with dynamically added primary keys
WebSep 15, 2024 · If the table receiving new data and schema from a merge has a primary key, new rows from the incoming data are matched with existing rows that have the same Original primary key values as those in the incoming data. If the columns from the incoming schema match those of the existing schema, the data in the existing rows is modified. WebJan 11, 2012 · This can be done by watching the constraints in datatable dt1 and resolving those contraints in datatable dt2 with code (by updating the null or non-unique or foriegn key data in target datatable dt2); and then start the merge operation. The following excerpt and link from MSDN explains this while doing the Merge operation: WebOct 26, 2016 · Try setting the primary key in each table via something like dtCalls.PrimaryKey = new DataColumn [] { dtCalls.Columns [0], dtCalls.Columns [1] }; (assuming Date is part of the PK here). Do the same for dtPages, then try your merge again. Share Improve this answer Follow answered Oct 26, 2016 at 17:17 wablab 1,693 … bohremulsion entsorgen