TextBox Modified and TextChanged : TextBox « GUI Windows Forms « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. GUI Windows Forms
3. TextBox

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");
  }
}

23.17.TextBox
	23.17.1.	Get input value from TextBox and display it vis a messagebox
	23.17.2.	TextBox key pressed event
	23.17.3.	TextBox Modified and TextChanged
	23.17.4.	TextBox: Multiline and BorderStyle
	23.17.5.	TextBox Keyevent hander
	23.17.6.	TextBox cancel event
	23.17.7.	Count lines in the TextBox and read text in TextBox line by line
	23.17.8.	TextBox selection
	23.17.9.	TextBox validation
	23.17.10.	Add ContextMenu to TextBox
	23.17.11.	Use Regular Expression to Check the input for a TextBox
	23.17.12.	Multiline TextBox
	23.17.13.	Simple Editor