calling web service for windowes form in c#

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C#

ASP.NET

hello sir ,
I have a problem sir I create a window form in this I have many text box,and combo box, sir I want to create the web service for this form to save the value in database table but sir I create the web method in ".asmx" form then I not found the text box intelisense. I want to create the method for insert the the values in database, and I want to call this method to button_click

  [WebMethod]

    public void saleslead()
    {
        SqlConnection con = new SqlConnection("Data Source=WHIZ-48\\SQLEXPRESS;Initial Catalog=George;User ID=sa;Password=net@123");
        con.Open();
        SqlCommand cmd = new SqlCommand("insert into SalesLead values("")",con);
        cmd.ExecuteNonQuery();
        
    
    }
}

Sir In this insert command we here want to text box for user run time enter the values and save data in database table .
please give me solution.
Thanks sir
Arvind kumar singh

[Edited]Code is Wrapped in "pre" tags[/Edited]