Admission Form with List Box using C#

In this articles, I am using Listbox ,radio box ,check box,and textbox  Admission Form

Program

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 Admission_Form_with_List_Box
{
     public partial class frmAdmission : Form
     {
          public frmAdmission()
          {
               InitializeComponent();
          }

          private void btnDisplay_Click(object sender, EventArgs e)
          {
               double mobt = 0, mtot = 0,
                         iobt = 0, itot = 0,
                         bobt = 0, btot = 0,
                         merit = 0;
               int hafiz = 0, computer = 0;
               if (chkHafiz.Checked)
               {
                    hafiz = 20;
               }
               if (chkComputer.Checked)
               {
                    computer = 10;
               }
               if (lstProgram.SelectedIndex != -1)
               {
                    if (lstProgram.SelectedItem.ToString() == "BS( CS )")
                    {
                         iobt = Convert.ToDouble(txtIObt.Text);
                         itot = Convert.ToDouble(txtITot.Text);
                         merit = (iobt + hafiz) / itot * 100;
                         txtMerit.Text = merit.ToString();
                         if (merit > 80)
                         {
                              txtRemarks.Text = "Congratulations...!";
                         }
                         else
                         {
                              txtRemarks.Text = "Wait for other merit list";
                         }
                    }
                    else if (lstProgram.SelectedItem.ToString() == "MCS")
                    {
                         mobt = Convert.ToDouble(txtMObt.Text);
                         mtot = Convert.ToDouble(txtMTot.Text);
                         merit += mobt / mtot * 30;
                         iobt = Convert.ToDouble(txtIObt.Text);
                         itot = Convert.ToDouble(txtITot.Text);
                         merit += iobt / itot * 30;
                         bobt = Convert.ToDouble(txtBObt.Text);
                         btot = Convert.ToDouble(txtBTot.Text);
                         merit += (bobt + hafiz + computer) / btot * 40;
                         txtMerit.Text = merit.ToString();
                         if (merit > 71)
                         {
                              txtRemarks.Text = "Congratulations...!";
                         }
                         else
                         {
                              txtRemarks.Text = "Wait for other merit list";
                         }
                    }
               }
          }

          private void lstProgram_SelectedIndexChanged(object sender, EventArgs e)
          {
               if (lstProgram.SelectedIndex != -1)
               {
                    if (lstProgram.SelectedItem.ToString() == "BS( CS )")
                    {
                         txtAppNo.Enabled = true;
                         txtName.Enabled = true;
                         txtMObt.Enabled = false;
                         txtMTot.Enabled = false;
                         txtIObt.Enabled = true;
                         txtITot.Enabled = true;
                         txtBObt.Enabled = false;
                         txtBTot.Enabled = false;
                    }
                    else if (lstProgram.SelectedItem.ToString() == "MCS")
                    {
                         txtAppNo.Enabled = true;
                         txtName.Enabled = true;
                         txtMObt.Enabled = true;
                         txtMTot.Enabled = true;
                         txtIObt.Enabled = true;
                         txtITot.Enabled = true;
                         txtBObt.Enabled = true;
                         txtBTot.Enabled = true;
                    }
               }
          }

          private void frmAdmission_Load(object sender, EventArgs e)
          {
               txtAppNo.Enabled = false;
               txtName.Enabled = false;
               txtMObt.Enabled = false;
               txtMTot.Enabled = false;
               txtIObt.Enabled = false;
               txtITot.Enabled = false;
               txtBObt.Enabled = false;
               txtBTot.Enabled = false;
          }

          private void btnClear_Click(object sender, EventArgs e)
          {
               lstProgram.ClearSelected();
               txtAppNo.Clear();
               txtName.Clear();
               txtAppNo.Enabled = false;
               txtName.Enabled = false;
               rdoMale.Checked = false;
               rdoFemale.Checked = false;
               chkComputer.Checked = false;
               chkHafiz.Checked = false;
               txtMObt.Enabled = false;
               txtMTot.Enabled = false;
               txtIObt.Enabled = false;
               txtITot.Enabled = false;
               txtBObt.Enabled = false;
               txtBTot.Enabled = false;
               txtMerit.Enabled = false;
               txtRemarks.Enabled = false;
               txtMObt.Clear();
               txtMTot.Clear();
               txtIObt.Clear();
               txtITot.Clear();
               txtBObt.Clear();
               txtBTot.Clear();
               txtMerit.Clear();
               txtRemarks.Clear();
          }

          private void btnExit_Click(object sender, EventArgs e)
          {
               this.Close();
          }
    }
}