calling windows form from console in C#

Question

I'm using C# .net 4.0 VS 2010.

I copied the following code here in Stackoverflow and confirmed all from the reference that this is suppose to work, but i am having syntax error on my call on the "Application.Run(new ShoutBox());" the error is "The type or namespace 'ShoutBox' could not be found."

The project was originally build as a console application. I just recently added a windows form named ShoutBox and is saved as ShoutBox.cs. I have transfer my code to the form so it does not display stuff in console rather on a textbox of the windows form i created.

What did i missed? And how can i make it work?

    using System;
    using System.Windows.Forms;

    namespace ChatApp
    {
        class ConsoleApplication1
        {


            [STAThread]
            static void Main()
            {
                Application.EnableVisualStyles();


                //this one works
                Application.Run(new Form()); // or whatever


                //this one does not work, error on second ShoutBox
                Form ShoutBox = new Form();
                Application.Run(new ShoutBox()); 
            }


        }
    }

Just for reference, here is my final working code: This code creates a new Shoutbox form instead of a blanked form.

    using System;
    using System.Windows.Forms;
    using ShoutBox; // Adding this

    namespace ChatApp
    {
        class ConsoleApplication1
        {        
            [STAThread]
            static void Main()
            {
                Application.EnableVisualStyles();
                Form ShoutBox1 = new ShoutBox.ShoutBox(); //Changing this
                Application.Run(ShoutBox1);               //Changing this
            }
        }
    }

where my Shoutbox form are as follows:

    using System
    using System.Windows.Forms;
    namespace ShoutBox
    {
        public partial class ShoutBox : Form
        {
    ....

This is a simple compilation error. Search for "The type or namespace could not be found." You're either missing a Reference (is the ShoutBox class in a different Project?) and/or missing a using (is the ShoutBox class in a different Namespace?) and/or it does not exist (is the ShoutBox class defined anywhere?) - there are many answers that cover this and it has nothing inherently to do with Forms. Quite simply: the code in question cannot resolve the ShoutBox type. — user2246674
– user2246674, Commented Jul 14, 2013 at 22:37

Steve · Accepted Answer · 2013-07-14 22:36:47Z

5

ShoutBox is the name of a variable referencing a Form, you can't call new ShoutBox().

You have already instantiated the form in the previous line, now you call simply

 Application.Run(ShoutBox);

But, if you have a form called ShoutBox defined in this way

namespace ShoutBox
{
     public partial class ShoutBox: Form
     {
        .....
     }
}

then you need to add the using declaration at the beggining of your file

using ShoutBox;

or you can simply change the namespace used in the ShoutBox.cs file to the same namespace used in the program Main file

namespace ChatApp
{
     public partial class ShoutBox: Form
     {
        ....    
     }
}

edited Jul 14, 2013 at 22:36

answered Jul 14, 2013 at 22:30

Steve

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1 Comment

Ace Caserya Over a year ago

This solves the problem. Thanks. I'll accept it as soon as I'm able.

Simon Whitehead · Accepted Answer · 2013-07-14 22:30:51Z

0

You are missing either one or two things.

Firstly, you need to import the namespace that ShoutBox is in:

using Your.Namespace.Where.ShoutBox.Is.Declared;

An easy way to do this in Visual Studio is to put your cursor somewhere on the word ShoutBox and either press Alt+Shift+F10 or.. as some people who are much more productive than I am do, press Ctrl+.. This will bring up a menu that will show the namespace that needs to be included.

Also, if that namespace is in another assembly (you alluded to that), then you need to add it as a reference to the project.

Also, this:

Form ShoutBox = new Form();
Application.Run(new ShoutBox());

..is incorrect. I would suggest a tutorial on basic class creation.

answered Jul 14, 2013 at 22:30

Simon Whitehead

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Comments

TcKs · Accepted Answer · 2013-07-14 22:31:20Z

0

The ShoutBox class is propably in different namespace.

And the code Form ShoutBox = new Form(); is useless, you need only Application.Run(new ShoutBox());.

answered Jul 14, 2013 at 22:31

TcKs

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