AddCourses.cs

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;
using System.Data.SqlClient;

namespace StudentManagementSystem
{
    public partial class AddCourses : Form
    {
        SqlConnection conn;
        public AddCourses()
        {
            InitializeComponent();
        }

        private void btnAddCourse_Click(object sender, EventArgs e)
        {
            try
            {
                //in database, your data will be in the form of relational data
                //in dataset, your data will be in the form of objects

                conn = new SqlConnection("Data Source=DESKTOP-QG8ONMB;Initial Catalog=StudentManagementSystem;Integrated Security=True");

                DataSet dataSet = new DataSet();

                SqlDataAdapter sqlDataAdapter = new SqlDataAdapter("select * from [addCourses]", conn);

                //two methods to add data (Fill, Update)
                sqlDataAdapter.Fill(dataSet, "[addCourses]");

                DataRow dataRow = dataSet.Tables["[addCourses]"].NewRow();

                dataRow["title"] = txtTitle.Text;
                dataRow["description"] = txtDescriptions.Text;
                dataRow["creditHours"] = txtCR.Value;
                dataRow["offeredDate"] = DTPicker.Value;

                dataSet.Tables["[addCourses]"].Rows.Add(dataRow);

                SqlCommandBuilder sqlCommandBuilder = new SqlCommandBuilder(sqlDataAdapter);
                //update method used to send data to database
                sqlDataAdapter.Update(dataSet, "[addCourses]");

                MessageBox.Show("Course Added Successfully");
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
                throw;
            }
        }
    }
}