following is my C# to insert data but it do not get inserted. why?

Question

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

using System.Data.SqlClient;

namespace sample1

{

public partial class main : Form

{

SqlConnection conn = new SqlConnection(@"Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename=C:\Users\lovel\Desktop\inder\Assign3\Assign3\DataG3.mdf;Integrated Security=True;Connect Timeout=30");

SqlCommand cmd;

public main()

{

InitializeComponent();

}

private void studLoginButton_Click(object sender, EventArgs e)

{

conn.Open();

cmd = new SqlCommand("INSERT INTO loginTab('" + txtStudUser.Text + "','" + txtStudPass.Text + "')", conn);

cmd.ExecuteNonQuery();

conn.Close();

MessageBox.Show("Done");

}

}