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How to save changes from a datagridview to a SQL Server 2008 database using Linq to SQl

I have a VS 2010 windows form application, where the user can edit/add new rows into a datagridview. I use Linq to SQL to populate the datagridview with the existing data from the database. My question is when the user clicks on the Save button, how do I write the changes and/or new data entered back to the database, using Linq to SQL?

Below is the c# code I use to populate the datagridview.
OperationsDataContext opDC = new OperationsDataContext();

                dgTime.DataSource = opDC.Tasks_GetByProjectIDAndWeekEndingDate(Convert.ToInt32(cboTimeProject.SelectedValue), dtWeekEnding.Value);


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C#Microsoft SQL Server 2008

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8/22/2022 - Mon