C# Windows Application Project

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;

namespace WindowsForm_octoberbatch23
{
public partial class BillingPage : Form
{
public BillingPage()
{
InitializeComponent();
}

private void rdb_1_CheckedChanged(object sender, EventArgs e)
{
rdb_1.ForeColor = System.Drawing.Color.Green;
rdb_2.ForeColor = System.Drawing.Color.Red;

comboBox1.Items.Clear();


comboBox1.Items.Add("kaka kaka");
comboBox1.Items.Add("varanum aayiram");
comboBox1.Items.Add("NGK");

}

private void rdb_2_CheckedChanged(object sender, EventArgs e)
{
rdb_1.ForeColor = System.Drawing.Color.Red;
rdb_2.ForeColor = System.Drawing.Color.Green;

comboBox1.Items.Clear();

comboBox1.Items.Add("viswasam");
comboBox1.Items.Add("Arrambam");
comboBox1.Items.Add("Dheena");

}

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
if (comboBox1.SelectedItem.ToString() == "kaka kaka")
{
txt_price.Text = "250";
}

else if (comboBox1.SelectedItem.ToString() == "varanum aayiram")
{
txt_price.Text = "500";
}

else if (comboBox1.SelectedItem.ToString() == "NGK")
{
txt_price.Text = "170";
}

else if (comboBox1.SelectedItem.ToString() == "viswasam")
{
txt_price.Text = "120";
}

else if (comboBox1.SelectedItem.ToString() == "Arrambam")
{
txt_price.Text = "400";
}

else if (comboBox1.SelectedItem.ToString() == "Dheena")
{
txt_price.Text = "300";
}

else
{
txt_price.Text = "0";
}

txt_total.Text = "";
txt_noOfSeats.Text = "";
}

private void txt_noOfSeats_TextChanged(object sender, EventArgs e)
{
if (txt_noOfSeats.Text.Length > 0)
{
txt_total.Text = (Convert.ToInt16(txt_price.Text) *
Convert.ToInt16(txt_noOfSeats.Text)).ToString();
}
}

private void btn_add_Click(object sender, EventArgs e)
{
string[] arr = new string[4];
arr[0] = comboBox1.SelectedItem.ToString();
arr[1] = txt_price.Text;
arr[2] = txt_noOfSeats.Text;
arr[3] = txt_total.Text;

ListViewItem lv = new ListViewItem(arr);

listView1.Items.Add(lv);
}
}
}

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;

namespace Gridview
{
    public partial class Check_listbox : Form
    {
        public Check_listbox()
        {
            InitializeComponent();
        }

        private void btn_fetch_Click(object sender, EventArgs e)
        {
            // listBox1.Items.Clear();
            listBox1.Items.Clear();
            foreach (String programs in checkedListBox1.CheckedItems)
                listBox1.Items.Add(programs);

        }

        private void linkLabel1_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
        {
            Pageload pd = new Pageload();
            pd.Show();
            this.Hide();
        }
}
}

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Gridview
{
    public partial class Pageload : Form
    {
        public Pageload()
        {
            InitializeComponent();

            sort("id");
        }


        private void sort(String value)
        {

            SqlConnection con = new SqlConnection(@"Data Source=DESKTOP-UA2SORD;Initial Catalog=window_octbatch;Integrated Security=True");
            con.Open();
            SqlCommand cmd = new SqlCommand("sp_cusfetch", con);
            cmd.CommandType = CommandType.StoredProcedure;
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            DataSet ds = new DataSet();
            da.Fill(ds);
            //dataGridView1.DataSource = ds.Tables[0];


            DataView dv=new DataView(ds.Tables[0]);
            dv.Sort = value;

            dataGridView1.DataSource = dv;
            con.Close();
                
                
     }

     private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            sort(comboBox1.SelectedItem.ToString());

        }

        private void Pageload_Load(object sender, EventArgs e)
        {
            Form2 fm = new Form2();
            fm.Show();
            this.Hide();
        }

        private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {

        }
    }
}

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;

namespace WindowsForm_octoberbatch23
{
    public partial class Form2 : Form
    {
        public Form2()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            groupBox1.Visible = true;
            groupBox2.Visible = false;
            button1.BackColor = Color.Blue;
            button2.BackColor = Color.White;

        }

        private void button2_Click(object sender, EventArgs e)
        {
            groupBox1.Visible = false;
            groupBox2.Visible = true;
            button1.BackColor = Color.White;
            button2.BackColor = Color.Blue;
        }

        private void Form2_Load(object sender, EventArgs e)
        {
            groupBox1.Visible = true;
            groupBox2.Visible = false;
        }
    }
}