Why Won't This Dataadapter Insert Rows Into The Database?

So I have a situation where I am using a SqlDataAdapter to insert rows into a table in a SQL Server 2014 database. The source of the data is an Excel spreadsheet. The insert works

Solution 1:

Each DataTable tracks the RowState of its rows, so manually adding data in a loop works because they are all Added (it has nothing to do with manually creating the DataTable - its the rows). When you load from some other source like Excel, they are not added/new.

If you use a DataAdapter to fill the table, you can tell it not to set the RowState to Unchanged. This is very useful for migrating data from one data store to another:

myDA.AcceptChangesDuringFill = False
...
rows = myDA.Fill(xlDT)

Solution 2:

I had the same issue, and the solution was quite simple, once you've seen it... I had my Database in Visual studio, and its property "Copy to Output Directory" was set to "Copy always", instead of "Do not copy". So everytime I was running my code, the database was erased!

Solution : - modify your connection string so it points directly to your database - Change your database property to "Do not copy"