how to update SQL using C# code example

Example: how to update database using sql in c#

using (var sqlConnection = new SqlConnection(config.ConnectionString))
{
	foreach(var position in positions)
	{
		var sql =
         	$"UPDATE BillOfMaterial SET Position = '{pos}' WHERE Creator = '{position.Creator}' AND Idx = '{position.Idx}' AND ArtNumber = '{position.ArtNumber}'";
          using (var sqlCommand = new SqlCommand(sql,sqlConnection))
          {
               sqlConnection.Open();
               sqlCommand.ExecuteNonQuery();
               sqlConnection.Close();
          }
   	}
}