If You use dataSet then see whether it have query for update or not in table adapter.
Now take a button on which click the data will be saved in database.
on this button click event use
private void button2_Click(object sender, EventArgs e)
{
try
{
yourTableAdapter.Update(yourDataSet.tablename);
MessageBox.Show("Record Updated", "Message", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
catch (Exception ex)
{
MessageBox.Show("Some Error in Update", "Message", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
}