why i cannot clear the rows in the datagridview control?

Question

I was doing this test, I need to re-load the datagridview with data every 4 seconds and the data was coming from a database.

so i'v created a timer control by code and added an event handler to the tick event. Then in the tick event

void t1_Tick(object sender, EventArgs e)
{

    dataGridView1.DataSource = null;
    dataGridView1.Rows.Clear();
    dt = Product.GetAllProductsBasicInfo();
    dataGridView1.DataSource = dt;

}

above code works but when I move

dataGridView1.Rows.Clear();

before

dataGridView1.DataSource = null;

it will throw a run time error saying the rows cannot be cleared, I want to know why it throws this error, typically Clear() clears the datagridview?

thanks

Answer 1

typically Clear() clears the datagridview?

Yes, unless it has a DataSource, which in your case, it does.

So try clearing the source of the data instead:

dt.Rows.Clear();