make the controls in the fom works without button click

hello... i have two issues:

1. i have put a checkbox which will show a legend, when it is checked... i have used different codes, wthout any successes: the codes are as follows:

a. inside Form1_Load method

checkBox1.AutoCheck = true;

if (checkBox1.Checked)

{

legend1.Visible = true;

}

else

{

legend1.Visible = false;

}

b. i used seperate methods

protected void CheckBox1_CheckedChanged(object sender, EventArgs e)

{

legend1.Visible = checkBox1.Checked;

}

and

private void checkBox1_CheckStateChanged(object sender, EventArgs e)

{

if (checkBox1.Checked)

{

legend1.Visible = true;

}

else

{

legend1.Visible = false;

}

nothing happens and i dont get any error... the form hasnt any button and i dont want it...

***************************

2. i am trying to plot a graph in a scatter graph in the same form, which reads frequencies and calculate the function and plot it... how can i do it without any button... is it posiible?

appreciate any help... kind regards, venus