Windows Forms: Delete multiple Rows from DataGridView based on CheckBox selection in C#

Step 1: Click New Project, then select Visual C# on the left, then Windows and then select Windows Forms Application. Name your project "DeleteSelectedValue" and then click OK

Step 2: Design your form as below

Step 3: Create an Entity Framework Model, then select category table from Northwind database

Step 4: Add code to handle your form as below

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 DeleteSelectedValue
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        TestEntities db;

        private void Form1_Load(object sender, EventArgs e)
        {
            //Init data
            db = new TestEntities();
            categoryBindingSource.DataSource = db.Categories.ToList();
        }

        private void btnDelete_Click(object sender, EventArgs e)
        {
            //Delete data
            int total = dataGridView.Rows.Cast<DataGridViewRow>().Where(p => Convert.ToBoolean(p.Cells["Selected"].Value) == true).Count();
            if (total > 0)
            {
                string message = $"Are you sure want to delete {total} row?";
                if (total > 1)
                    message = $"Are you sure want to delete {total} rows";
                if (MessageBox.Show(message, "Message", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes)
                {
                    for(int i = dataGridView.RowCount - 1; i >= 0; i--)
                    {
                        DataGridViewRow row = dataGridView.Rows[i];
                        //Check row selected
                        if (Convert.ToBoolean(row.Cells["Selected"].Value) == true)
                        {
                            db.Categories.Remove((Category)row.DataBoundItem);
                            categoryBindingSource.RemoveAt(row.Index);
                        }
                    }
                }
            }
        }

        private async void btnSave_Click(object sender, EventArgs e)
        {
            //Save data to sql database
            categoryBindingSource.EndEdit();
            await db.SaveChangesAsync();
            MessageBox.Show("Your data has been successfully saved.", "Message", MessageBoxButtons.OK, MessageBoxIcon.Information);
        }
    }
}

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