save new rows in grid

how can i insert only new rows from grid into database and only update the existing rows.
how to find which is new and which are existing rows ?
rohitnet100Asked:
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Carl TawnSystems and Integration DeveloperCommented:
If you are updating using something like a DataAdapter then you just call the Update() method passing it your DataSet/DataTable. The DataAdapter will figure out for itself which rows require inserts and which require updates.
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rohitnet100Author Commented:
can you send me a sample code, how to do this?
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Carl TawnSystems and Integration DeveloperCommented:
Very simplisticly:
Dim cn As New SqlConnection("Your connection string")
Dim adap As New SqlDataAdapter("SELECT SomeColumns FROM SomeTable", cn)

Dim dt As New DataTable()
adap.Fill(dt)

'// add some rows, change some rows, etc

'// commit the changes
adap.Update(dt)

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CodeCruiserCommented:
If you are saving the grid contents manually then you can use the primary key to determine if its an existing record or new one.
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rohitnet100Author Commented:
Thanks.
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