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Adding Data to MDF file with SqlDataAdapter

using System; using System.Data;            using System.Data.SqlClient;  using System.Collections.Generic; using System.Text;   class Program   {     static void Main(string[] args)     {       SqlConnection thisConnection = new SqlConnection(                 @"Data Source=.\SQLEXPRESS;" +                 @"AttachDbFilename='NORTHWND.MDF';" +                 @"Integrated Security=True;Connect Timeout=30;User Instance=true");       SqlDataAdapter thisAdapter = new SqlDataAdapter("SELECT CustomerID, CompanyName FROM Customers", thisConnection);       SqlCommandBuilder thisBuilder = new SqlCommandBuilder(thisAdapter);       DataSet thisDataSet = new DataSet();       thisAdapter.Fill(thisDataSet, "Customers");       Console.WriteLine(thisDataSet.Tables["Customers"].Rows.Count);       DataRow thisRow = thisDataSet.Tables["Customers"].NewRow();       thisRow["CustomerID"] = "1";       thisRow["CompanyName"] = "ABC Ltd.";       thisDataSet.Tables["Customers"].Rows.Add(thisRow);       Console.WriteLine(thisDataSet.Tables["Customers"].Rows.Count);       thisAdapter.Update(thisDataSet, "Customers");       thisConnection.Close();     }   }