Nisam bas neki napredni korisnik, ne znam jesam li te bas dobro skuzio i dobro odradio. Evo koda pa ako mozes pogledat gdje grijesim;
private void button2_Click(object sender, EventArgs e)
{
string upit = "SELECT * FROM Proizvod";
SqlConnection conn = new SqlConnection("Data Source=.\\SQLEXPRESS; AttachDbFilename = D:\\Documents and Settings\\\My Documents\\Visual Studio 2008\\Projects\\proba\\baza.mdf; Integrated Security=True; Connect Timeout=30; User Instance=True");
SqlCommand cmd = new SqlCommand(upit, conn);
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataSet dt = new DataSet();
da.Fill(dt);
dataGridView1.Rows.RemoveAt(dataGridView1.CurrentRow.Index);
BindingSource bd = new BindingSource();
bd.DataSource = dt;
bd.EndEdit();
da.Update(dt);