Design

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
public partial class ValidationForm : System.Web.UI.Page
{
    
    protected void Register_Click(object sender, EventArgs e)
    {
        SqlConnection con = new SqlConnection();
        SqlCommand cmd = new SqlCommand();
        con.ConnectionString = @"Data Source=DESKTOP-5H5O8UP\SQLEXPRESS1;Initial Catalog=registrationform;Integrated Security=True";
        con.Open();
        cmd.Connection = con;
        cmd.CommandText = "insert into register values('"+txtname.Text+"','"+txtemail.Text+"','"+txtcontact.Text+"',"+txtage.Text+",'"+txtpass.Text+"','"+txtconfpass.Text+"')";
        cmd.ExecuteNonQuery();
        Response.Write("Record inserted");
    }
}
  
            

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Add this code in your Web.config file after system.web

         <appsettings>
             <add key="ValidationSettings:UnobtrusiveValidationMode" value="None" />
         </appsettings>

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Output

Validate Form after enter wrong details

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After enter correct details