C# using index r in other functions

Question

I'm a C# beginner and like your input!

I have a datagridview and want to do some stuff with the selected rows. I dont want to place all the tasks in one large function..... I'd like to split it up in seperate task-functions. I'm using 'r' to have the index of the selected line. But how do I get that index 'r' to be used in the functions do_stuff1, do_stuff2,....?

Or am I going about this the wrong way?

private void button1_Click_1(object sender, EventArgs e)
{
    foreach (DataGridViewRow r in dataGridView1.SelectedRows)
    {
        do_stuff1();
        do_stuff2();
        do_stuff3();
    }
}

private void do_stuff1()
{
    //do stuff1 with selected row r
}

...

All help kindly appreciated!

Answer 1

This comment from @Serg helped me out:

just pass r as parameter: declare function as private void do_stuff1(DataGridViewRow r) and then call as do_stuff1(r);

Thanks to @Serg and @ZoharPeled