How to invoke web service into my website?

Add a default.aspx page into your site.
and add two text boxes for entering username and password and one button to check gold price

and right click on References then add webreference if its not there
add service reference then click advanced there you can see add web reference button and give this url in url field http://www.freewebservicesx.com/GetGoldPrice.asmx[^]

and add reference to your site.


on button click add below code

com.freewebservicesx.www.GetGoldPrice mys = new com.freewebservicesx.www.GetGoldPrice();
           string a=firstnum.Text;
           string b=secondnum.Text;
           string[] c = mys.GetCurrentGoldPrice(a, b);
          
           foreach (var d in c)
           {
               ScriptManager.RegisterStartupScript(this, GetType(), "showalert", "alert('"+d+"');", true);

           }

run your application and
You have to register in Free Web Service site and pass your username and password on the textboxes and click on button then you will get gold price as alert.
You can modify it as per your requirement