Register Page In ASP.Net By Using C# code

Register Page In ASP.Net By Using C# code

------------------------------------C# Code----------------------------

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.SqlClient;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
 
    protected void Button1_Click(object sender, EventArgs e)
    {
        SqlConnection con = new SqlConnection(@"data source=saibaba-pc\server; database=Genreal; integrated security=SSPI");
//integrated security=SSPI means only for windows authentication
        con.Open();
        string username, password, mailid, phoneno;
        username=TextBox1.Text;
        password=TextBox2.Text;
        mailid = TextBox3.Text;
        phoneno= TextBox4.Text;
        string sqlinsert;
        sqlinsert = "insert into registration(username,password,mailid,phoneno) values('" + username + "','" + password + "','" + mailid + "'," + phoneno + ")";
        SqlCommand cmd = new SqlCommand(sqlinsert,con);
        cmd.ExecuteNonQuery();
        Label5.Text = "datails are saved";
       // con.Close();
    }
}