This is ASP.NET application I have created. But I cannot connect this project to my database

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ASP.NET

.NET

WebForms

I cannot understand how to connect this to the database. and if I want to convert this project into mvc how to do it. I am new to Asp.net and willing to learn this. please help. what are the good frontend languages for asp.net or usually we use all frontend and backend in one project like below. Thank you

What I have tried:

default.aspx.cs

<pre>using System;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;

namespace WebApplication4
{
    public partial class _Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                UpdateCounts();
            }
        }

        protected void btnPass_Click(object sender, EventArgs e)
        {
            InsertInspection("Pass", null);
            UpdateCounts();
        }

        protected void btnFail_Click(object sender, EventArgs e)
        {
            lblFailReason.Visible = true;
            ddlFailReason.Visible = true;
            btnFailSubmit.Enabled = false; // Disable the Submit button initially
        }

        protected void ddlFailReason_SelectedIndexChanged(object sender, EventArgs e)
        {
            btnFailSubmit.Enabled = !string.IsNullOrEmpty(ddlFailReason.SelectedValue);
        }

        protected void btnFailSubmit_Click(object sender, EventArgs e)
        {
            if (!string.IsNullOrEmpty(ddlFailReason.SelectedValue))
            {
                InsertInspection("Fail", ddlFailReason.SelectedValue);
                UpdateCounts();
                HideFailControls();
            }
        }

        private void InsertInspection(string decision, string failReason)
        {
            string connectionString = ConfigurationManager.ConnectionStrings["DefaultConnection"].ConnectionString;

            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                connection.Open();

                using (SqlCommand command = new SqlCommand("InsertMaterialInspection", connection))
                {
                    command.CommandType = CommandType.StoredProcedure;
                    command.Parameters.AddWithValue("@Decision", decision);

                    if (decision == "Pass")
                    {
                        command.Parameters.AddWithValue("@FailReason", DBNull.Value);
                    }
                    else
                    {
                        command.Parameters.AddWithValue("@FailReason", failReason);
                    }

                    command.ExecuteNonQuery();
                }
            }
        }

        private void UpdateCounts()
        {
            string connectionString = ConfigurationManager.ConnectionStrings["DefaultConnection"].ConnectionString;

            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                connection.Open();

                using (SqlCommand command = new SqlCommand("GetInspectionCounts", connection))
                {
                    command.CommandType = CommandType.StoredProcedure;

                    using (SqlDataReader reader = command.ExecuteReader())
                    {
                        if (reader.Read())
                        {
                            int totalCount = Convert.ToInt32(reader["TotalCount"]);
                            int passCount = Convert.ToInt32(reader["PassCount"]);
                            int failCount = Convert.ToInt32(reader["FailCount"]);

                            lblTotalCount.Text = $"Total Count: {totalCount}";
                            lblPassCount.Text = $"Pass Count: {passCount}";
                            lblFailCount.Text = $"Fail Count: {failCount}";
                        }
                    }
                }
            }
        }




        private void HideFailControls()
        {
            ddlFailReason.SelectedIndex = 0; // Reset dropdown to default
            ddlFailReason.Visible = false;
            lblFailReason.Visible = false;
            btnFailSubmit.Enabled = false; // Disable the Submit button after submitting
        }
    }
}

default.aspx

<%@ Page Title="Home Page" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="WebApplication4._Default" %>

<asp:Content ID="BodyContent" ContentPlaceHolderID="MainContent" runat="server">

    <div class="jumbotron">
        <h1>Material Inspection System</h1>
        <p class="lead">Inspect materials and record pass/fail decisions.</p>
    </div>

    <div class="row">
        <div class="col-md-4">
            <h2>Pass</h2>
            <asp:Button ID="btnPass" runat="server" Text="Pass" OnClick="btnPass_Click" CssClass="btn btn-success" />
        </div>
        <div class="col-md-4">
            <h2>Fail</h2>
            <asp:Button ID="btnFail" runat="server" Text="Fail" OnClick="btnFail_Click" CssClass="btn btn-danger" />
            <br />
            <asp:Label ID="lblFailReason" runat="server" Text="Reason for Failure:" Visible="false"></asp:Label>
            <asp:DropDownList ID="ddlFailReason" runat="server" Visible="false" AutoPostBack="true" OnSelectedIndexChanged="ddlFailReason_SelectedIndexChanged">
                <asp:ListItem Text="Select Reason" Value="" />
                <asp:ListItem Text="Defect" Value="Defect" />
                <asp:ListItem Text="Incorrect Specification" Value="Incorrect Specification" />
                <asp:ListItem Text="Damage" Value="Damage" />
            </asp:DropDownList>
            <br />
            <asp:Button ID="btnFailSubmit" runat="server" Text="Submit" OnClick="btnFailSubmit_Click" CssClass="btn btn-danger" Enabled="false" />
        </div>
        <div class="col-md-4">
            <h2>Inspection Summary</h2>
            <div>
                <asp:Label ID="lblTotalCount" runat="server" Text="Total Count: 0"></asp:Label><br />
                <asp:Label ID="lblPassCount" runat="server" Text="Pass Count: 0"></asp:Label><br />
                <asp:Label ID="lblFailCount" runat="server" Text="Fail Count: 0"></asp:Label>
            </div>
        </div>
    </div>

</asp:Content>

webconfig

<connectionStrings>
		<add name="DefaultConnection" connectionString="Data Source=DESKTOP-RVJ62NT\SQLEXPRESS;Initial Catalog=testdb1;Integrated Security=True" providerName="System.Data.SqlClient" />
	</connectionStrings>

Store procedure

CREATE TABLE MaterialInspections (
    InspectionID INT IDENTITY(1,1) PRIMARY KEY,
    Decision NVARCHAR(50),
    FailReason NVARCHAR(100)
);

CREATE PROCEDURE InsertMaterialInspection
    @Decision NVARCHAR(50),
    @FailReason NVARCHAR(100) = NULL
AS
BEGIN
    INSERT INTO MaterialInspections (Decision, FailReason)
    VALUES (@Decision, @FailReason);
END;

CREATE PROCEDURE GetInspectionCounts
AS
BEGIN
    SELECT
        (SELECT COUNT(*) FROM MaterialInspections) AS TotalCount,
        (SELECT COUNT(*) FROM MaterialInspections WHERE Decision = 'Pass') AS PassCount,
        (SELECT COUNT(*) FROM MaterialInspections WHERE Decision = 'Fail') AS FailCount
END