Controls

Controls such as buttons and lists allow your user to interact with your program. Drag and drop controls on to the form to use. The ListBox is shown here. I will continue to add to this page. But other controls work in a similar way.

ListBox

To add two list items:

listBox1.Items.Add("hello");
listBox1.Items.Add("goodbye");

To find out the index for the item selected by the user and assign to a variable called pos:

int pos = listBox1.SelectedIndex;

To find the currently selected item and display it:

MessageBox.Show(listBox1.SelectedItem.ToString());

To find out the number of items in the list and assign to a variable called total:

int total = listBox1.Items.Count;

To remove an item from the list you must supply the position. The following code will remove the first item:

listBox1.Items.RemoveAt(0);

Advanced - Dynamically creating buttons

To dynamically create as many buttons as you want, use the following code:

// create the button...
Button myButton = new Button();
myButton.Text = "Click Me";

// add it to the form...
Controls.Add(myButton);

// set the position and the size...
myButton.SetBounds(10,10, 50, 50);

Advanced - Dyanmically add images to your form

PictureBox picBox = new PictureBox();

// set the picture name.
picBox.Image = Image.FromFile("cat.jpg");

// bring to front
picBox.BringToFront();

// set the position
picBox.Location = new Point(10, 10);

// set the size
picBox.Size = new Size(500, 500);