private void button1_Click(object sender, EventArgs e) { SqlConnection conn = new SqlConnection(); conn.ConnectionString = ConfigurationManager.ConnectionStrings["connstr"].ConnectionString; conn.Open(); string user = textBox1.Text; string pass = textBox2.Text; string sql = "insert into dbo.customer(username,password) values(" + user + "," + pass + ")"; SqlCommand cmd = new SqlCommand(sql, conn); cmd.ExecuteNonQuery(); conn.Close(); this.Hide(); login log = new login(); log.Show(); }