TextBox Modified and TextChanged : TextBox : GUI Windows Forms C# Examples

    
using  System;
using  System.Drawing;
using  System.Windows.Forms;

public  class  TextBoxTextChanged  :  Form
{
    TextBox  txt;
    string  strOriginal;

    public  TextBoxTextChanged()
    {
        Size  =  new  Size(300,  375);
                              
        txt  =  new  TextBox();
        txt.Parent  =  this;
        txt.Text  =  "Enter  text  here.";
        txt.Size  =  new  Size(ClientSize.Width  -  20,  ClientSize.Height  -  100);
        txt.Location  =  new  Point(10,10);
        txt.TextChanged  +=  new  System.EventHandler(txt_TextChanged);
        txt.Multiline  =  true;
        txt.BorderStyle  =  BorderStyle.Fixed3D;
        txt.ScrollBars  =  ScrollBars.Vertical;
        txt.Anchor  =  AnchorStyles.Left  |  AnchorStyles.Right  |  AnchorStyles.Top  |  AnchorStyles.Bottom;
        strOriginal  =  txt.Text;

    }

    static  void  Main()  
    {
        Application.Run(new  TextBoxTextChanged());
    }

    private  void  txt_TextChanged(object  sender,  EventArgs  e)
    {
        if  (strOriginal  ==  txt.Text)
            txt.Modified  =  false;
        else
            txt.Modified  =  true;

        if  (txt.Modified)
            MessageBox.Show("changed");
        else
            MessageBox.Show("no  change");
    }
}