problem in connecting to the database ( through coding not in design)

Hi

I am Very new to C#. Extremely sorry for my long description. I am trying an application which connect to the database and inserts the records to the database. My application name is EMPAPP. I added database to my application like this. In the solution explorer, by right clicking on the project , selecting add new Item then selecting database. Database name is EMP.mdf. I added two text boxes and one button. In the button click event I wrote the following code.

private void button1_Click(object sender, EventArgs e)

{

 string connString = "Data Source=.\\SQLEXPRESS;AttachDbFilename=|DataDirectory|\\EMP.mdf;Integrated Security=True;User Instance=True";

SqlConnection conn = new SqlConnection(connString);

SqlCommand cmd = new SqlCommand();

try

{

    conn.Open();

    cmd.Connection = conn;

    cmd.CommandText = "insert into EMPTAB(ID,NAME) values

    ('" + textBox1.Text + "','" + textBox2.Text + "')";

    cmd.ExecuteNonQuery();

    conn.Close();

    MessageBox.Show("One Record Inserted Successfully");

 }

 catch(Exception ex)

 {

       MessageBox.Show(ex.Message);

 }

After running the application and clicking on the button, iam getting “One Record Inserted Successfully”. However if I check tables data in server explorer, no data is there in the table.

I don’t know what went wrong in this. Please somebody help me out.

I tried changing the connection string like this

1)    string connString = "Data Source=.\\SQLEXPRESS;Initial Catalog =

                        EMP;Integrated Security=True";

When run this application and cliked on buton , then I am getting “Invalid object name EMPTAB”.

2)    If I change connection like this

string connString = "Data Source=.\\SQLEXPRESS;Initial Catalog = EMP.mdf;Integrated Security=True" ;

Here also I am getting error

“A Connection was succesfuly established with server.but then an error occurred during the login process.(Provider : shared memory provider ,error=0-no process is on the other side of pipe.)”