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What is the C# Using block and why should I use it?

Whats the significance of using block? Why should i write my code inside using block?

eg:

SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["newConnectionString"].ConnectionString);
using (con)
{
    con.Open();            
    //
    // Some code
    //
    con.Close();
}

Is this the right way of using using statement?

Answer 1

using goes together with the IDisposable interface.

It guarantees that before exiting the scope the Dispose method would be called on the object in the using clause.

There is no other reason than that.