C# Open a form from another form, which is located in a different project

Question

I have two different projects, DriverSide and LogInForm. In both of them is a form, in DriverSide the form Form1 will be executed on the start of the application and in LogInForm the important form is the UserOnTrip form. On Form1 is a button and with it´s click event i want to open the UserOnTrip form, but i dont know how to handle it because the forms are on different projects.

This is my button click method:

private void _btnAccept_Click(object sender, EventArgs e)
{
        LogInForm._pnlUserOntrip _pnl = new LogInForm._pnlUserOntrip();
        _pnl.Show();
        //System.Diagnostics.Process.Start(Application.StartupPath.ToString() + @"\_pnlUserOnTrip.exe");

        LogInForm.LoadingScreen _load = new LogInForm.LoadingScreen();
        _load.Hide();
    }
}

And this is the layout of my solution explorer:

Make your code more readable: https://learn.microsoft.com/en-gb/dotnet/csharp/programming-guide/inside-a-program/coding-conventions — akop, Oct 25 '17 at 08:31
What are *"User and Driver side"*? 2 different PCs? Then you need some kind of communications between them, probably network communications. — Sinatr, Oct 25 '17 at 08:32
@Sinatr I guess he just means two different projects in one solution in VS. I think he just misses out to import a reference from the other namespace to be able to call it´s form. — L. Guthardt, Oct 25 '17 at 08:34
@L.Guthardt I have done the 2 project 1 solution but the problem is whenever i call the form it runs in Driver project not in the User ones. — user8815467, Oct 25 '17 at 08:36

L. Guthardt · Answer 1 · 2017-10-25T10:39:47.087

Go to your solution explorer and right click on the project you want to execute. Now click 'Set as start project'. This project gets highlighted then a bit, you should see atleast any difference.

Have a look at this picture. There are the two different projects: John.Socialclub.Data and John.Socialclub.Desktop. And you dont click on any of those files below, right click on of your projects itself and set them simply as start project.

Updated:

So i understood it that way, that you execute in the project DriverSide the Form1. On this form you have a button which shell open the form UserOnTrip which is located in the LogInForm project.

First of all you want to add a reference to the DriverSide project. Go once again to the solution explorer and righ click on References. Then click Add reference. Then a menu pops up where you select on the left side projects. Now there should be your project LogInForm listed, you select it with the comboBox and press OK.

Now we are in the Form1 of DriverSide:

In the beginning note that you have to add this using reference to use the reference to the LogInForm. Add this to the other using references.

using LogInForm;

namespace DriverSide
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void _btnAccept_Click(object sender, EventArgs e)
        {
            UserOnTrip testWindow = new UserOnTrip();
            testWindow.Show();
        }
    }
}

I just copied your button click method _btnAccept_Click. Insert this code and you should be fine. You can ignore the constructor public Form1(), i just placed it in there that you feel familiar with your code and understand exactly where to place what.

C# Open a form from another form, which is located in a different project

1 Answers1