handle keyevent in c#

Do the following:

Set the form's KeyPreview to true so that the form can capture the Spacebar.

this.KeyPreview = true;

Then use the KeyDown event of the form:

this.KeyDown += new KeyEventHandler(Form1_KeyDown);

void Form1_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.Space)
            {
                MessageBox.Show("key pressed");
            }
        }

Should work now..

And importantly set

this.KeyPreview = true;

on your form's constructor, or simply use the form designer and set the KeyPreview parameter to true.

And finally have look Here[^]

If you wants to handle events on form then try this

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
        KeyPreview = true;
        KeyDown += new KeyEventHandler(Form1_KeyDown);
    }

    void Form1_KeyDown(object sender, KeyEventArgs e)
    {
        System.Diagnostics.Debug.Write(e.KeyCode);
    }
}

And for specific control you must handle event on that control.

For example :



Handle the KeyDown event to determine the type of character entered into the control.

private void textBox1_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e)
{
    // Initialize the flag to false.
    nonNumberEntered = false;

    // Determine whether the keystroke is a number from the top of the keyboard.
    if (e.KeyCode < Keys.D0 || e.KeyCode > Keys.D9)
    {
        // Determine whether the keystroke is a number from the keypad.
        if (e.KeyCode < Keys.NumPad0 || e.KeyCode > Keys.NumPad9)
        {
            // Determine whether the keystroke is a backspace.
            if(e.KeyCode != Keys.Back)
            {
                // A non-numerical keystroke was pressed.
                // Set the flag to true and evaluate in KeyPress event.
                nonNumberEntered = true;
            }
        }
    }
}