SQL server express, cannot read or write in C#

I have a code written that automatically adds and reads information from my SQL Server 2012 Express table, Logins. But it wont work, here is the code:

private void Form1_Load(object sender, EventArgs e)
    {
        SqlConnection myConnection = new SqlConnection("user id=myComputer;" + "server=MYCOMPUTER-PC\\SQLEXPRESS;" +
                "Trusted_Connection=yes;" + "database=loginTest; " + "connection timeout=5");
        try
        {
            myConnection.Open();
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.ToString());
        }
        SqlCommand myCommand = new SqlCommand("INSERT INTO dbo.Logins Values ('John','Password','Admin')", myConnection);
        try
        {
            SqlDataReader myReader = null;
            SqlCommand myCommand1 = new SqlCommand("select * from Logins",
                                                     myConnection);
            myReader = myCommand1.ExecuteReader();
            while (myReader.Read())
            {
                MessageBox.Show(myReader["Column1"].ToString());
                MessageBox.Show(myReader["Column2"].ToString());
            }
        }
        catch (Exception ex1)
        {
            MessageBox.Show(ex1.ToString());
        }
    }

I have debugged the program and it all seems to go through fine, it skips over :

        {
            MessageBox.Show(myReader["Column1"].ToString());
            MessageBox.Show(myReader["Column2"].ToString());
        }

for some reason, and it doesnt write the values i told it to.

Can anyone tell me why? Im a beginner at SQL, so go easy please :)

PS It doesnt fire out any error codes or exceptions