ASP.NET MVC：如何在Controller加载时将Controller返回的变量打印到View？

Question

I want to sum all the values in a column of my table in SQL Database and display it on page load itself. What I did is:

public ActionResult Sumthem() {
    string constr = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
    SqlConnection con = new SqlConnection(constr);
    SqlCommand cmd = new SqlCommand("SELECT SUM (Final) FROM SomeTable", con);
    cmd.Connection.Open();    


    ViewBag.FinalSUM = cmd.ExecuteScalar().ToString();

    return View("Records");   
}     

I want to print it like this (in Records.cshtml view):

@{var sum = ViewBag.FinalSUM;}
<h2>The Total is: @sum</h2>

Where and how should I call the controller method? I tried @Url.Action("Sumthem", "Records") in the Razor, but the controller method was not getting called. How can I return and print the value of the sum as soon as the page loads?

Edit: I tried this after that, but there was a System.StackOverflow error

@{Html.RenderAction("Sumthem", "Records");
var sum = ViewBag.FinalSUM;}
<h2>The Total is: @sum</h2>
//Returned PartialView instead of View from the Controller.

Answer 1

Action :

public ActionResult Sumthem() {
    string constr = System.Configuration.ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
    using (SqlConnection con = new SqlConnection(constr))
    {
        SqlCommand cmd = new SqlCommand("SELECT SUM (Final) FROM SomeTable", con);
        cmd.Connection.Open();

        ViewBag.FinalSUM = cmd.ExecuteScalar().ToString();

        return PartialView("Records", new YourModel())
    }   
}    

Partial View (Records.chstml):

@model YourModel
@*You can use data from your model as well*@
<h2>The Total is: @ViewBag.FinalSUM</h2>

Usage (in any view where you actually need your total value to be displayed):

@Html.RenderAction("Sumthem", "Records")