How can I call a c# function in aspx page without refreshing and reloading ?

Hi; 

this is my code for button click event . :

protected void Button1_Click(object sender, EventArgs e)
{
int x = Convert.ToInt32(txtDecimal.Text);
mabnaConvertor mc = new mabnaConvertor();
txtBinary.Text = mc.convertor(x, 2);
txtHexa.Text = mc.convertor(x, 16);
txtOctal.Text = mc.convertor(x, 8);
}

but I want do this code without refreshing and reloading page . 

what should I do ? would you give me the required JS code 

Thanks :)