Delete selected rows from DataGridView and Database

Question

I want to delete the selected rows from DataGridView and this delete should affect the database. I'm using the Entity Framework and that is my code which did not work.

private void button4_Click(object sender, EventArgs e)
{
    var toBeDeleted = (int)dataGridView1.SelectedRows[0].Cells[0].Value;
    var TE = new TaskEntities();
    var UD = new userdata();
    UD = TE.userdatas.First(c => c.ID == toBeDeleted);
    TE.DeleteObject(UD);
    TE.SaveChanges();
}

Answer 1

Is your DGV bound to any dataSource? Is so, delete row from datasource, and then do use Update command (or update sql query) to do chnages in database.

Answer 2

try this:

private void button4_Click(object sender, EventArgs e)
{
     var toBeDeleted = (int)dataGridView1.SelectedRows[0].Cells[0].Value;
     var TE = new TaskEntities();
     var userdata = TE.userdatas.First(c => c.ID == toBeDeleted);
     TE.userdatas.Remove(userdata);
     TE.SaveChanges();
     dataGridView1.DataSource = TE.userdatas;
}