Why does my save use the initial value of my TextBox and not the entered value?

Question

I have a textbox on my website:

On page l

Answer 1

I think its because PostBack

If you're calling setCoordinates() on some button's click event textbox's new value will be lost. If that's right change Page_Load like this one

protected void Page_Load(object sender, EventArgs e)
{
    if(!IsPostBack)
    {
        Latitude.Text = thisPlace.Latitude;
    }    
}