A problem with button click

Question

Dear C#corner

I have a problem to know the numbers of clicks on a buttons.

this is my program but It is not true;

int c=0;

protected void Button1_Click(object sender, EventArgs e)

{

Label1.Text = c.ToString();

c = c + 1;

}

after clicking on button, c will be 1 and it does not change anymore.

best regards