C# | SU [ 61 - 70 ] [ FOR JOURNAL ]

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Home > C# | SU [ 61 - 70 ] [ FOR JOURNAL ]

CODE


namespace Definitions
{
    public partial class MDIParentForm : Form
    {
        public MDIParentForm()
        {
            InitializeComponent();
            // This property makes this form a parent container
            this.IsMdiContainer = true; 
        }

        private void newWindowToolStripMenuItem_Click(object sender, EventArgs e)
        {
            // Creates and displays a new child form inside the parent
            Form childForm = new Form();
            childForm.MdiParent = this;
            childForm.Text = "New Child Document";
            childForm.Show();
        }

        private void closeAllToolStripMenuItem_Click(object sender, EventArgs e)
        {
            // Loops through and closes all open child forms
            foreach (Form child in this.MdiChildren)
            {
                child.Close();
            }
        }
    }
}

OUTPUT

MDI Parent Form

File

Window

Child Document 1

Child Content

New Child Document

Active Child Content

CODE


namespace Definitions
{
    public partial class Form62 : Form
    {
        public Form62()
        {
            InitializeComponent();
        }

        private void Form62_Load(object sender, EventArgs e)
        {
            // Adding parent node
            TreeNode rootNode = new TreeNode("C:\\");
            treeView1.Nodes.Add(rootNode);

            // Adding child nodes
            TreeNode windowsNode = new TreeNode("Windows");
            TreeNode usersNode = new TreeNode("Users");
            TreeNode programFilesNode = new TreeNode("Program Files");

            rootNode.Nodes.Add(windowsNode);
            rootNode.Nodes.Add(usersNode);
            rootNode.Nodes.Add(programFilesNode);

            // Adding sub-child node
            usersNode.Nodes.Add(new TreeNode("User"));
            
            // Expand the entire tree automatically
            treeView1.ExpandAll();
        }
    }
}

OUTPUT

TreeView Example

- 🖴 C:\

+ 📁 Windows

- 📁 Users

👤 User

+ 📁 Program Files

CODE


using System.Data;

namespace Definitions
{
    public partial class Form63 : Form
    {
        public Form63()
        {
            InitializeComponent();
        }

        private void Form63_Load(object sender, EventArgs e)
        {
            DataTable table = new DataTable();
            table.Columns.Add("ID", typeof(int));
            table.Columns.Add("Name", typeof(string));
            table.Columns.Add("Course", typeof(string));

            // Adding rows of data to the table
            table.Rows.Add(1, "John", "CS");
            table.Rows.Add(2, "Rahul", "BBA");
            table.Rows.Add(3, "Priya", "B.Com");

            // Bind the table to the DataGridView
            dataGridView1.DataSource = table;
        }
    }
}

OUTPUT

DataGridView Form

ID	Name	Course
1	John	CS
2	Rahul	BBA
3	Priya	B.Com

CODE


namespace Definitions
{
    public partial class Form64 : Form
    {
        public Form64()
        {
            InitializeComponent();
        }

        private void btnSubmit_Click(object sender, EventArgs e)
        {
            // Checks if the textbox is empty or only contains whitespace
            if (string.IsNullOrWhiteSpace(txtName.Text))
            {
                MessageBox.Show("Name cannot be empty!", "Validation Error", 
                                MessageBoxButtons.OK, MessageBoxIcon.Error);
                
                // Focus returns the cursor to the textbox so the user can fix the error
                txtName.Focus();
            }
            else
            {
                MessageBox.Show("Form submitted successfully!");
            }
        }
    }
}

OUTPUT

Validation Form

Enter Name:

* Name is required

CODE


namespace Definitions
{
    public partial class LoginForm : Form
    {
        public LoginForm()
        {
            InitializeComponent();
            // Masks the password characters with an asterisk
            txtPassword.PasswordChar = '*'; 
        }

        private void btnSubmit_Click(object sender, EventArgs e)
        {
            string username = txtUsername.Text;
            string password = txtPassword.Text;

            // Simple validation check for demonstration
            if (username == "admin" && password == "admin123")
            {
                MessageBox.Show("Login Successful!", "Success", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
            else
            {
                MessageBox.Show("Invalid Username or Password.", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }
    }
}

OUTPUT

Username:

admin

Password:

********

Success

ℹ️ Login Successful!

CODE


namespace Definitions
{
    public partial class Form66 : Form
    {
        public Form66()
        {
            InitializeComponent();
        }

        private void Form66_Load(object sender, EventArgs e)
        {
            // The ToolTip component must be added from the toolbox first
            toolTip1.SetToolTip(btnSave, "Click here to save your work.");
            toolTip1.SetToolTip(txtEmail, "Enter a valid email address.");
        }
    }
}

OUTPUT

Tooltip Example

Click here to save your work.

🖱️

CODE


namespace Definitions
{
    public partial class Form67 : Form
    {
        public Form67()
        {
            InitializeComponent();
        }

        private void checkedListBox1_ItemCheck(object sender, ItemCheckEventArgs e)
        {
            // Get the text of the item currently being checked or unchecked
            string selectedItem = checkedListBox1.Items[e.Index].ToString();

            // If the user checks the box, add it to the normal ListBox
            if (e.NewValue == CheckState.Checked)
            {
                if (!listBox1.Items.Contains(selectedItem))
                {
                    listBox1.Items.Add(selectedItem);
                }
            }
            // If the user unchecks the box, remove it from the normal ListBox
            else if (e.NewValue == CheckState.Unchecked)
            {
                if (listBox1.Items.Contains(selectedItem))
                {
                    listBox1.Items.Remove(selectedItem);
                }
            }
        }
    }
}

OUTPUT

CheckedListBox Sync

Available Courses

C# Programming Java Development Web Design

Selected Courses

C# Programming

Web Design

CODE


namespace Definitions
{
    public partial class Form68 : Form
    {
        public Form68()
        {
            InitializeComponent();
            // Start with the button disabled
            btnNext.Enabled = false; 
        }

        private void chkAgree_CheckedChanged(object sender, EventArgs e)
        {
            // The button's enabled state will directly match whether the box is checked
            btnNext.Enabled = chkAgree.Checked;
        }

        private void btnNext_Click(object sender, EventArgs e)
        {
            MessageBox.Show("Proceeding to next step...");
        }
    }
}

OUTPUT

Terms and Conditions

I agree to the terms and conditions

CODE


namespace Definitions
{
    public partial class Form69 : Form
    {
        public Form69()
        {
            InitializeComponent();
        }

        // Moves a single selected item from ListBox1 to ListBox2
        private void btnMoveRight_Click(object sender, EventArgs e)
        {
            if (listBox1.SelectedItem != null)
            {
                listBox2.Items.Add(listBox1.SelectedItem);
                listBox1.Items.Remove(listBox1.SelectedItem);
            }
        }

        // Moves ALL items from ListBox1 to ListBox2
        private void btnMoveAllRight_Click(object sender, EventArgs e)
        {
            foreach (var item in listBox1.Items)
            {
                listBox2.Items.Add(item);
            }
            listBox1.Items.Clear();
        }

        // Moves a single selected item from ListBox2 back to ListBox1
        private void btnMoveLeft_Click(object sender, EventArgs e)
        {
            if (listBox2.SelectedItem != null)
            {
                listBox1.Items.Add(listBox2.SelectedItem);
                listBox2.Items.Remove(listBox2.SelectedItem);
            }
        }

        // Moves ALL items from ListBox2 back to ListBox1
        private void btnMoveAllLeft_Click(object sender, EventArgs e)
        {
            foreach (var item in listBox2.Items)
            {
                listBox1.Items.Add(item);
            }
            listBox2.Items.Clear();
        }
    }
}

OUTPUT

Item Mover

Item A

Item D

Item B

Item C

CODE


namespace Definitions
{
    public partial class Form70 : Form
    {
        public Form70()
        {
            InitializeComponent();
        }

        private void btnRegister_Click(object sender, EventArgs e)
        {
            string name = txtName.Text;
            string course = txtCourse.Text;
            
            // Format the string exactly how we want it to look in the box
            string output = "--- Registration Summary ---\n" +
                            "Student Name: " + name + "\n" +
                            "Course: " + course + "\n" +
                            "Status: Registered Successfully\n\n";

            // Append allows us to add multiple students without erasing previous ones
            richTextBox1.AppendText(output);
            
            // Clear inputs so it is ready for the next student
            txtName.Clear();
            txtCourse.Clear();
            txtName.Focus();
        }
    }
}

OUTPUT

Student Registration

Name:

Course:

                                    --- Registration Summary ---

                                    Student Name: John Doe

                                    Course: CS

                                    Status: Registered Successfully

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Monday, 16 March 2026