Data Adapter

I have a database names database1 and i am using Vistual Stdio 2012 , I create a connection and fill table from database through SqlDataAdapter Object using fill method , then i create a row in (in-memory database) and insert data in that row through parameterized query and add these patameters in data adapter likeusing System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
using System.Threading.Tasks; 
using System.Data.SqlClient; 
using System.Data; 

namespace ConsoleApplication3 
{ 
class Program 
{ 
static void Main(string[] args) 
{ 
string cs = @"Data Source=(LocalDB)\v11.0;AttachDbFilename=E:\EAD\ConsoleApplication3\ConsoleApplication3\Database1.mdf;Integrated Security=True"; 
SqlConnection con = new SqlConnection(cs); 
string q = "Select * from Student"; 
SqlCommand cmd = new SqlCommand(q, con); 
con.Open(); 
SqlDataAdapter da = new SqlDataAdapter(); 
DataTable t = new DataTable("t"); 
da.SelectCommand = cmd; 
da.Fill(t); 
foreach (DataRow r in t.Rows) 
{ 
Console.Write("Id = " + r[0]+" "); 
Console.Write("Name = " + r[1]+" "); 
Console.WriteLine("Cgpa = " + r[2]); 

} 
//Add new Row 



string q1 = "Insert into Student (Id,Name,Cgpa) value (@I,@N,@C) "; 
Console.WriteLine("Insert ki query sahi chal rahi hai"); 

SqlCommand cmd1 = new SqlCommand(q1, con); 
 
SqlParameter p1 = new SqlParameter("I",SqlDbType.Variant,50,"Id"); 

SqlParameter p2 = new SqlParameter("N", SqlDbType.VarChar, 50, "Name"); 

SqlParameter p3 = new SqlParameter("C", SqlDbType.VarChar, 50, "Cgpa"); 

cmd1.Parameters.Add(p1); 

cmd1.Parameters.Add(p2); 

cmd1.Parameters.Add(p3); 

da.InsertCommand = cmd1; 

DataRow r1 = t.NewRow(); 
r1[0] = 15; 
r1[1] = "Ahmad"; 
r1[2] = "6.7"; 
t.Rows.Add(r1); 





da.Update(t); 

con.Close(); 
} 
}