Show a new form when click a button

Question

I am new in c#. I am trying to show a new form (form2) when click button in form1.

this is my code.

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

        private void Form1_Load(object sender, EventArgs e)
        {

        }
        private void button5_Click(object sender, EventArgs e)
        {   
            Form2 form2 = new Form2();
            form2.ShowDialog();            
         }
    }
}

the error show

the type or namespace name 'Form2' could not be found (are you missing a using directive or an assembly reference?)

this is my code for form2.

    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 SliceEngine
{
    public partial class Form2 : Form
    {
        public Form2()
        {
            InitializeComponent();
        }

        private void Form2_Load(object sender, EventArgs e)
        {

        }
    }
}

for form2, i just making the design interface.

all i know when using java, i only need to declare the object first. what should i do for this?

Answer 1

I don't see any reason to fail your code, unless you have any typo. I have tried the same code as yours and it worked well on my machine.

    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 winapp
    {
        public partial class Form1 : Form
        {
            public Form1()
            {
                InitializeComponent();
            }
            private void button1_Click(object sender, EventArgs e)
            {
                Form2 frm2 = new Form2();
                frm2.ShowDialog();
            }
        }




    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 winapp
    {
        public partial class Form2 : Form
        {
            public Form2()
            {
                InitializeComponent();
            }
        }
    }

Answer 2

the type or namespace name 'Form2' could not be found (are you missing a using directive or an assembly reference?)

It means that you forgot to add the namespace that points to the Form2 directory to your code

If you have got a Form2.cs inside a directory named UI and that directory is inside MyForms directory, then the whole tree would be ProjectName >> MyForms >> UI >> Form2.cs

So you should use this namespace in your code

using ProjectName.MyForms.UI;

Now I should be able to start showing it easily cause I've added its location.

new Form2().Show();

OR instead of all that and bother adding a namespace, you can just use:

new ProjectName.MyForms.UI.Form2().Show();