This is an example from the MSDN documentation on BinaryFormatter that I modified for you. For other kinds of serialization check the System.Runtime.Serialization.Formatters namespace.

Good luck!

using System;
using System.IO;
using System.Collections;
using System.Runtime.Serialization.Formatters.Binary;
using System.Runtime.Serialization;
using System.Data;

public class App
{
[STAThread]
static void Main()
{
Serialize();
Deserialize();
Console.ReadLine();
}

static void Serialize()
{
// Create a hashtable of values that will eventually be serialized.
DataTable table = new DataTable();
table.Columns.Add( new DataColumn( "ID", typeof( System.Int32 ) ) );
table.Columns.Add( new DataColumn( "CustName", typeof( System.String ) ) );

// Add some data
DataRow workRow;

for( int i = 0; i <= 9; i++ )
{
workRow = table.NewRow();
workRow [ 0 ] = i;
workRow [ 1 ] = "CustName" + i.ToString();
table.Rows.Add( workRow );
}

// To serialize the hashtable and its key/value pairs,
// you must first open a stream for writing.
// In this case, use a file stream.
FileStream fs = new FileStream( "DataFile.dat", FileMode.Create );

// Construct a BinaryFormatter and use it to serialize the data to the stream.
BinaryFormatter formatter = new BinaryFormatter();
try
{
formatter.Serialize( fs, table );
}
catch( SerializationException e )
{
Console.WriteLine( "Failed to serialize. Reason: " + e.Message );
throw;
}
finally
{
fs.Close();
}
}


static void Deserialize()
{
// Declare the hashtable reference.
DataTable table = null;

// Open the file containing the data that you want to deserialize.
FileStream fs = new FileStream( "DataFile.dat", FileMode.Open );
try
{
BinaryFormatter formatter = new BinaryFormatter();

// Deserialize the hashtable from the file and
// assign the reference to the local variable.
table = (DataTable) formatter.Deserialize( fs );
}
catch( SerializationException e )
{
Console.WriteLine( "Failed to deserialize. Reason: " + e.Message );
throw;
}
finally
{
fs.Close();
}

// To prove that the table deserialized correctly,
// display the key/value pairs.
for( int i = 0; i< table.Rows.Count; i++ )
{
Console.WriteLine( "ID: {0}; CustName: {1}",table.Rows[0], table.Rows[1] );
}
}
}