private void button2_Click(object sender, EventArgs e)
{
try
{
BookLibraryEntities ctx = new BookLibraryEntities();
Book b = new Book();
b.ID = 1;
ctx.Books.Attach(b);
DbEntityEntry entry = ctx.Entry(b);
var allProps = entry.CurrentValues.PropertyNames;
entry.Property("ID").IsModified = false;
entry.Property("Name").IsModified = false;
entry.Property("Author").IsModified = false;
entry.Property("Category").IsModified = false;
entry.State = EntityState.Unchanged;
b.Author = "My Updated Author2";
ctx.ChangeTracker.DetectChanges();
entry.Property("ID").IsModified = false;
entry.Property("Name").IsModified = false;
//entry.Property("Author").IsModified = false;
entry.Property("Category").IsModified = false;
//entry.Property("Author").IsModified = true;
//entry.State = EntityState.Modified;
ctx.SaveChanges();
}
catch (System.Data.Entity.Validation.DbEntityValidationException ex)
{
}
}
private void button1_Click(object sender, EventArgs e)
{
BookLibraryEntities ctx = new BookLibraryEntities();
ctx.SaveChanges();
//=========================
}