Use the adapter's Update method to update the data. This overloaded method can take a DataTable as a parameter and will commit all the changes made to the data source. The name of the data table can be passed as an argument and can also be used to update the entire dataset in a more traditional manner. When using a data table as an argument to the Update method, the adapter evaluates the changes that have been made to the data table and executes the appropriate command for each row (INSERT, UPDATE, or DELETE).

The example below updates the Username of one of the NorthwindOData entries.

C#

using (CSVConnection connection = new CSVConnection(connectionString)) {
  CSVDataAdapter dataAdapter = new CSVDataAdapter(
    "SELECT Email, Username FROM NorthwindOData", connection);

  dataAdapter.UpdateCommand = new CSVCommand(
    "UPDATE NorthwindOData SET Username = @Username " +
    "WHERE Id = @Id", connection);
 
  dataAdapter.UpdateCommand.Parameters.Add(new CSVParameter("@Username", DbType.String, "Username"));
  dataAdapter.UpdateCommand.Parameters.Add(new CSVParameter("@Id", DbType.String, "Id"));
  dataAdapter.UpdateCommand.Parameters[1].SourceVersion = DataRowVersion.Original;

  DataTable table = new DataTable();
  dataAdapter.Fill(table);

  DataRow firstrow = table.Rows[0];
  firstrow["Username"] = "Ana Trujilo";

  dataAdapter.Update(table);

  Console.WriteLine("Rows after update.");
  
  foreach (DataRow row in table.Rows) {
    Console.WriteLine("{0}: {1}", row["Email"], row["Username"]);
  }
}

VB.NET

Using connection As New CSVConnection(connectionString)
  Dim dataAdapter As New CSVDataAdapter(
    "SELECT Email, Username FROM NorthwindOData", connection)
  
  dataAdapter.UpdateCommand = New CSVCommand(
    "UPDATE NorthwindOData SET Username = @Username " +
    "WHERE Id = @Id", connection)
  
  dataAdapter.UpdateCommand.Parameters.Add(new CSVParameter("@Username", DbType.String, "Username"))
  dataAdapter.UpdateCommand.Parameters.Add(new CSVParameter("@Id", DbType.String, "Id"))
  dataAdapter.UpdateCommand.Parameters(1).SourceVersion = DataRowVersion.Original
  
  Dim table As New DataTable()
  dataAdapter.Fill(table)
  
  Dim firstrow As DataRow = table.Rows(0)
  firstrow("Username") = "Ana Trujilo"
  
  dataAdapter.Update(table)
  
  Console.WriteLine("Rows after update.")
  
  For Each row As DataRow In table.Rows
    Console.WriteLine("{0}: {1}", row("Email"), row("Username"))
  Next
End Using