Key event : KeyEvent : GUI Windows Forms C# Examples

    
using  System;
using  System.Drawing;
using  System.Collections;
using  System.ComponentModel;
using  System.Windows.Forms;
using  System.Data;

public  class  KeyEventDetailInfo  :  System.Windows.Forms.Form
{
    private  System.Windows.Forms.TextBox  txtInput;
    private  System.Windows.Forms.Label  lblUpper;
    private  System.Windows.Forms.Label  label2;
    private  System.Windows.Forms.Label  label1;
    private  System.Windows.Forms.Label  lblLower;
    private  System.Windows.Forms.Button  btnReset;

    public  KeyEventDetailInfo()
    {
        InitializeComponent();
    }

    private  void  InitializeComponent()
    {
        this.txtInput  =  new  System.Windows.Forms.TextBox();
        this.btnReset  =  new  System.Windows.Forms.Button();
        this.lblUpper  =  new  System.Windows.Forms.Label();
        this.label2  =  new  System.Windows.Forms.Label();
        this.label1  =  new  System.Windows.Forms.Label();
        this.lblLower  =  new  System.Windows.Forms.Label();
        this.SuspendLayout();
        //  
        //  txtInput
        //  
        this.txtInput.Location  =  new  System.Drawing.Point(8,  8);
        this.txtInput.Name  =  "txtInput";
        this.txtInput.TabIndex  =  0;
        this.txtInput.Text  =  "";
        this.txtInput.KeyDown  +=  new  System.Windows.Forms.KeyEventHandler(this.txtInput_KeyDown);
        this.txtInput.KeyPress  +=  new  System.Windows.Forms.KeyPressEventHandler(this.txtInput_KeyPress);
        this.txtInput.KeyUp  +=  new  System.Windows.Forms.KeyEventHandler(this.txtInput_KeyUp);
        //  
        //  btnReset
        //  
        this.btnReset.Location  =  new  System.Drawing.Point(328,  8);
        this.btnReset.Name  =  "btnReset";
        this.btnReset.TabIndex  =  2;
        this.btnReset.Text  =  "Reset";
        this.btnReset.Click  +=  new  System.EventHandler(this.btnReset_Click);
        //  
        //  lblUpper
        //  
        this.lblUpper.BorderStyle  =  System.Windows.Forms.BorderStyle.Fixed3D;
        this.lblUpper.Location  =  new  System.Drawing.Point(368,  56);
        this.lblUpper.Name  =  "lblUpper";
        this.lblUpper.Size  =  new  System.Drawing.Size(32,  23);
        this.lblUpper.TabIndex  =  3;
        //  
        //  label2
        //  
        this.label2.Location  =  new  System.Drawing.Point(320,  56);
        this.label2.Name  =  "label2";
        this.label2.Size  =  new  System.Drawing.Size(40,  16);
        this.label2.TabIndex  =  4;
        this.label2.Text  =  "Upper:";
        this.label2.TextAlign  =  System.Drawing.ContentAlignment.MiddleRight;
        //  
        //  label1
        //  
        this.label1.Location  =  new  System.Drawing.Point(320,  104);
        this.label1.Name  =  "label1";
        this.label1.Size  =  new  System.Drawing.Size(40,  16);
        this.label1.TabIndex  =  5;
        this.label1.Text  =  "Lower:";
        this.label1.TextAlign  =  System.Drawing.ContentAlignment.MiddleRight;
        //  
        //  lblLower
        //  
        this.lblLower.BorderStyle  =  System.Windows.Forms.BorderStyle.Fixed3D;
        this.lblLower.Location  =  new  System.Drawing.Point(368,  104);
        this.lblLower.Name  =  "lblLower";
        this.lblLower.Size  =  new  System.Drawing.Size(32,  23);
        this.lblLower.TabIndex  =  6;
        //  
        //  KeyEventDetailInfo
        //  
        this.AutoScaleBaseSize  =  new  System.Drawing.Size(5,  13);
        this.ClientSize  =  new  System.Drawing.Size(417,  293);
        this.Controls.AddRange(new  System.Windows.Forms.Control[]  {
                                                                                          this.lblLower,
                                                                                          this.label1,
                                                                                          this.label2,
                                                                                          this.lblUpper,
                                                                                          this.btnReset,
                                                                                          this.txtInput});
        this.ResumeLayout(false);

    }
    [STAThread]
    static  void  Main()  
    {
        Application.Run(new  KeyEventDetailInfo());
    }

    private  void  txtInput_KeyDown(object  sender,  System.Windows.Forms.KeyEventArgs  e)
    {
        Console.WriteLine("KeyCode  name:  "  +  e.KeyCode);
        Console.WriteLine("KeyCode  key  code:  "  +  ((int)e.KeyCode));
        Console.WriteLine("KeyData  name:  "  +  e.KeyData);
        Console.WriteLine("KeyData  key  code:  "  +  ((int)e.KeyData));
        Console.WriteLine("KeyValue:  "  +  e.KeyValue);
        Console.WriteLine("Handled:  "  +  e.Handled);
    }

    private  void  txtInput_KeyPress(object  sender,  System.Windows.Forms.KeyPressEventArgs  e)
    {
        char  keyChar;
        keyChar  =  e.KeyChar;

        Console.WriteLine("KeyPress  event.");
        Console.WriteLine("KeyChar:  "  +  keyChar);
        Console.WriteLine("KeyChar  Code:  "  +  (int)keyChar);
        Console.WriteLine("Handled:  "  +  e.Handled);

        lblUpper.Text  =  keyChar.ToString().ToUpper();
        lblLower.Text  =  keyChar.ToString().ToLower();
    
        if  (keyChar.ToString()  ==  "$")
        {
            txtInput.AppendText("#");
            e.Handled  =  true;
        }
    }

    private  void  txtInput_KeyUp(object  sender,  System.Windows.Forms.KeyEventArgs  e)
    {
        Console.WriteLine("KeyCode  name:  "  +  e.KeyCode);
        Console.WriteLine("KeyCode  key  code:  "  +  ((int)e.KeyCode));
        Console.WriteLine("KeyData  name:  "  +  e.KeyData);
        Console.WriteLine("KeyData  key  code:  "  +  ((int)e.KeyData));
        Console.WriteLine("KeyValue:  "  +  e.KeyValue);
        Console.WriteLine("Handled:  "  +  e.Handled);
    }

    private  void  btnReset_Click(object  sender,  System.EventArgs  e)
    {
        txtInput.Text  =  "";
        lblUpper.Text  =  "";
        lblLower.Text  =  "";
    }
}