how to create message box in public static void method

Question

I have a public static method and I would like a message to be displayed if certain values are selected. This is in ASP.NET so adding using System.Windows.Forms; causes problems because I am using using System.Web.UI.WebControls;. So how do I create a message?

public static void UpdateSerialQtyRcvd(int SerNoID, int QtyRcvd)
{
     if (SerNo.QtyRcvd != 1)
     {
         if (SerNo.Reason == "")
         {
             //message
         }
     }
}

Javascript behing the code:

function UpdateSerialQtyRcvd(sender, SerNoID, QtyRcvd) {
        if (QtyRcvd < 0) {
            alert("Qty Rcvd must be greater than 0");
        }
        else {
            PageMethods.UpdateSerialQtyRcvdUserControl(SerNoID, QtyRcvd, OnUpdateSuccess, OnUpdateFail);
        }
}

Calling the web method:

[WebMethod]
public static void UpdateSerialQtyRcvdUserControl(int SerNoID, int QtyRcvd)
{
     JobDeliveryDebrief.UpdateSerialQtyRcvd(SerNoID, QtyRcvd);
}

Have you searched around a bit? I found a couple of post here on SO about that. — SuperOli, Aug 13 '15 at 14:01
@SuperOli yes I have search around but I couldn't find a solution — user123456789, Aug 13 '15 at 14:05
ok, then next time, please list the things you've tried in your post please. — SuperOli, Aug 13 '15 at 14:07
@SuperOli I did. I said I tried using System.Windows.Forms; but that wasn't working.. — user123456789, Aug 13 '15 at 14:08
Post the code of the OnUpdateSuccess, OnUpdateFail functions, you can show the alert box there — Enrique Zavaleta, Aug 18 '15 at 16:35

score 7 · Answer 1 · edited Aug 24 '15 at 07:32

7

Add a JavaScript alert:

clientscriptmanager.registerstartupscript(this.GetType(),"MyAlert","<script>alert('Hello');</script>",true);

To use ClientScript inside a static method pass the Page object as a parameter to your static method.Page is not static class.You can not call non static fields inside static method.So you need to pass the page object to your static method as a parameter.

protected void Page_Load(object sender, EventArgs e)
{
     UpdateSerialQtyRcvd(SerNoID, QtyRcvd,Page);
}

public static void UpdateSerialQtyRcvd(int SerNoID, int QtyRcvd,Page page)
{
    if (SerNo.QtyRcvd != 1)
    {
        if (SerNo.Reason == "")
        {
            page.ClientScript.RegisterStartupScript(page.GetType(),"alert", "<script>alert('Hai');</script>");
        }
    }        
}

edited Aug 24 '15 at 07:32

Salah Akbari

39,330
10
79
109

answered Aug 13 '15 at 14:01

shreesha

1,811
2
21
30

that causes the error: Error 2496 The name 'ClientScriptManager' does not exist in the current context – user123456789 Aug 13 '15 at 14:05
is it really aspx.cs page?? – shreesha Aug 13 '15 at 14:17
it is an ascx.cs page – user123456789 Aug 13 '15 at 14:22
use `ScriptManager.RegisterStartupScript(Page, Page.GetType(), "key", "", false);` – shreesha Aug 13 '15 at 14:25
another error: `Error 2496 An object reference is required for the non-static field, method, or property System.Web.UI.Control.Page.get` and `Error 2497 An object reference is required for the non-static field, method, or property 'object.GetType()'` – user123456789 Aug 13 '15 at 14:27
Try doing Page objPage=new Page();and replace page with objPage – shreesha Aug 13 '15 at 14:32
you are getting error because it is a static method – shreesha Aug 13 '15 at 14:35
But if I try call the LoadJavaScript function in my if statement I get the error: Error 47 An object reference is required for the non-static field, method, or property 'System.Web.UI.Control.Page.get'. I don't want to call the message in Page_Load, it needs to be called my UpdateSerialQtyRcvd function – user123456789 Aug 14 '15 at 08:32
This doesn't work. Gives the error invalid web service call. Missing value for parameter page – user123456789 Aug 17 '15 at 09:27

score 1 · Answer 2 · answered Aug 18 '15 at 13:17

This method show a message. The UpdateSerialQtyRcvd is in a WebUserControl.ascx as you want:

public static void UpdateSerialQtyRcvd(System.Web.UI.Page pg)
{
     pg.ClientScript.RegisterStartupScript(pg.GetType(), "alert", "<script>alert('Message');</script>");
}

Now you can add your if-statement like this:

public static void UpdateSerialQtyRcvd(System.Web.UI.Page pg, int qtyRcvd)
{
     if (qtyRcvd != 1)
     {
          //if (SerNo.Reason == "")
          //{
                pg.ClientScript.RegisterStartupScript(pg.GetType(), "alert", "<script>alert('Message');</script>");
          //}
     }
}

Now you can call to UpdateSerialQtyRcvd static method from every page that has registered the WebUserControl.ascx. like this:

YourPage.aspx:

<%@ Register Src="~/WebUserControl2.ascx" TagPrefix="uc1" TagName="WebUserControl2" %>
<uc1:WebUserControl2 runat="server" id="WebUserControl2" />

YourPage.aspx.cs:

protected void Page_Load(object sender, EventArgs e)
{
    WebUserControl2.UpdateSerialQtyRcvd(this,2);
}

score 1 · Answer 3 · answered Aug 21 '15 at 18:03

Change your business method to throw an exception when there is an error condition, like this:

public static void UpdateSerialQtyRcvd(int SerNoID, int QtyRcvd)
{
     if (SerNo.QtyRcvd != 1)
     {
         if (SerNo.Reason == "")
         {
             throw new Exception("Your message");
         }
     }
}

And handle the error in your javascript function, like this:

function OnUpdateFail(result) {
    alert(result.get_message());
}

Purvesh Desai · Answer 4 · 2015-08-24T09:14:20.857

1

Use ScriptManager.RegisterStartupScript(this, GetType(), "Message", "alert('Message');", true);

edited Aug 24 '15 at 09:14

answered Aug 24 '15 at 09:05

Purvesh Desai

1,797
2
15
39

score 0 · Answer 5 · answered Aug 24 '15 at 04:51

You could return desired message from static webmethod. And at the client side alert message using Javascript alert.

change return type of webmethod to string

[WebMethod]
public static string UpdateSerialQtyRcvdUserControl(int SerNoID, int QtyRcvd)
{
    return JobDeliveryDebrief.UpdateSerialQtyRcvd(SerNoID, QtyRcvd);
}

change return type of UpdateSerialQtyRcvd to string

public static void UpdateSerialQtyRcvd(int SerNoID, int QtyRcvd)
{
     if (SerNo.QtyRcvd != 1)
     {
         if (SerNo.Reason == "")
         {
             //message
             return "message";
         }
     }
}

In Javascript alert whatever message you get from webmethod in OnUpdateSuccess function

 function UpdateSerialQtyRcvd(sender, SerNoID, QtyRcvd) {
            if (QtyRcvd < 0) {
                alert("Qty Rcvd must be greater than 0");
            }
            else {
               PageMethods.UpdateSerialQtyRcvdUserControl(SerNoID, QtyRcvd, OnUpdateSuccess, OnUpdateFail);
            }
    }

how to create message box in public static void method

5 Answers5