Added new form, but cannot call/use it in code

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I added new form (Form3.cs) on my project with project --> add new form.

I tried to write:

C#

Form3 f3 = new Form3();

and underlines "Form3" and get the error:

C#

The type or namespace Form3.cs could not be found (are you missing a using directive or an assembly reference)?

I have not deleted anything.

How to fix this?

Posted 16-Mar-13 1:43am

marcel zol

Updated 16-Mar-13 2:31am

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)

v3

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Comments

Vreeti 16-Mar-13 7:51am

Hi... Please share the code u have written..
Also verify that the namespace of Form3 and the form in which u are calling Form3 are same or not..

Shubham Choudhary 16-Mar-13 7:51am

where is your form !!! in a folder or else!!!

marcel zol 16-Mar-13 9:25am

I just made a new project, add forms, wrote some code. Then i needed another form and add it, but this one i can not use it. Folder with this project contains Form3.cs, designer,...

[no name] 16-Mar-13 10:50am

Did you try rebuilding?

marcel zol 16-Mar-13 11:21am

Yes, i tried rebuilding. No luck.

[no name] 16-Mar-13 12:18pm

Did you try sharing the code like was requested hours ago?

marcel zol 16-Mar-13 12:29pm

the code on Form3 is:
<pre>using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace Aprer
{
public partial class Form3 : Form
{
public Form3()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{
Close();
}
}

}</pre>
On Form1 is:
<pre> Form3 f3 = new Form3();</pre>
and it underlines the Form3 and gives me the error

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wingzero007 · Accepted Answer · 2013-03-16T10:17:00

Hello!

I was able to replicate this kind of error message by changing the name of the namespace.

In your Form3 you have the following: namespace Aprer

C#

namespace Aprer   // This name must be the same as the namespace in Form1
{
    public partial class Form3 : Form
    {
        public Form3()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            Close();
        }
    }

}

This may be the problem.

Check the namespace of the form Form1 and Form3, they must be the same.

Or you can put in Form1: Using Aprer;

Or even:

C#

Aprer.Form3 f3 = new Aper.Form3();
f3.show();