String search in ComboBox

[Microsoft]

Hi All,

Any suggestions appreciated.
I am trying to do a string search through a comboBox list,
have created a simple test which is listed below. The problem
I am having is, every time a key is pressed it echoes the char
back to the combo twice. For example, if I type D in the combo
I get back Dd. The following app works OK if I use KeyPress
instead of KeyDown/KeyUp on my computer, but if I run it on
another computer (with .NET framework, without Visual Studio)
it does the doubling up thing as well.

?
Thx Regards
Steve
using System;
using System.Drawing;
using System.Collecti ons;
using System.Componen tModel;
using System.Windows. Forms;
using System.Data;

namespace KeyTest
{
/// <summary>
/// Summary description for Form1.
/// </summary>
public class Form1 : System.Windows. Forms.Form
{
private System.Windows. Forms.ComboBox comboBox1;
private System.Windows. Forms.TextBox textBox1;
private string sAccumulatedCha rs;
private int iFoundIndex = 0;
private System.Windows. Forms.Button button1;
/// <summary>
/// Required designer variable.
/// </summary>
private System.Componen tModel.Containe r components = null;

public Form1()
{
//
// Required for Windows Form Designer support
//
InitializeCompo nent();

//
// TODO: Add any constructor code after InitializeCompo nent call
//
}

/// <summary>
/// Clean up any resources being used.
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Disp ose();
}
}
base.Dispose( disposing );
}

#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeCompo nent()
{
this.comboBox1 = new System.Windows. Forms.ComboBox( );
this.textBox1 = new System.Windows. Forms.TextBox() ;
this.button1 = new System.Windows. Forms.Button();
this.SuspendLay out();
//
// comboBox1
//
this.comboBox1. Items.AddRange( new object[] {
"Joe Bloggs",
"Fred Flintstone",
"Barney Rubble",
"George Jetson",
"Sylvester" ,
"Tom & Jerry",
"Donald Duck",
"Mickey Mouse",
"Goofy",
"Bugs Bunny"});
this.comboBox1. Location = new System.Drawing. Point(8, 8);
this.comboBox1. Name = "comboBox1" ;
this.comboBox1. Size = new System.Drawing. Size(232, 21);
this.comboBox1. TabIndex = 0;
this.comboBox1. Text = "Joe Bloggs";
this.comboBox1. KeyDown += new
System.Windows. Forms.KeyEventH andler(this.com boBox1_KeyDown) ;
this.comboBox1. KeyUp += new
System.Windows. Forms.KeyEventH andler(this.com boBox1_KeyUp);
this.comboBox1. Leave += new System.EventHan dler(this.combo Box1_Leave);
//
// textBox1
//
this.textBox1.L ocation = new System.Drawing. Point(8, 80);
this.textBox1.N ame = "textBox1";
this.textBox1.S ize = new System.Drawing. Size(232, 20);
this.textBox1.T abIndex = 1;
this.textBox1.T ext = "";
//
// button1
//
this.button1.Lo cation = new System.Drawing. Point(80, 152);
this.button1.Na me = "button1";
this.button1.Ta bIndex = 2;
this.button1.Te xt = "Exit";
this.button1.Cl ick += new System.EventHan dler(this.butto n1_Click);
//
// Form1
//
this.AutoScaleB aseSize = new System.Drawing. Size(5, 13);
this.ClientSize = new System.Drawing. Size(248, 189);
this.Controls.A ddRange(new System.Windows. Forms.Control[] {
this.button1,
this.textBox1,
this.comboBox1} );
this.Name = "Form1";
this.Text = "Form1";
this.ResumeLayo ut(false);

}
#endregion

/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main()
{
Application.Run (new Form1());
}

private void comboBox1_KeyDo wn(object sender,
System.Windows. Forms.KeyEventA rgs e)
{
// alpha, space
if((e.KeyValue > 33 && e.KeyValue < 123) || e.KeyValue == 32)
{
sAccumulatedCha rs += Convert.ToChar( e.KeyValue);
iFoundIndex = comboBox1.FindS tring(sAccumula tedChars, 0);
}
else if(e.KeyValue == 8) // backspace
{
// if sAccumulatedCha r is empty, select 1st item
if (sAccumulatedCh ars.Length == 0)
{
iFoundIndex = 0;
}
else
{
// remove last char of accumulated string
sAccumulatedCha rs = sAccumulatedCha rs.Substring(0,
sAccumulatedCha rs.Length - 1);
iFoundIndex = comboBox1.FindS tring(sAccumula tedChars, 0);
}
}
if(e.KeyValue == 13)
{
comboBox1.Selec tedIndex = iFoundIndex;
textBox1.Focus( );
}
if(iFoundIndex >= 0)
{
comboBox1.Selec tedIndex = iFoundIndex;
selectText();
}
}

private void comboBox1_Leave (object sender, System.EventArg s e)
{
if (comboBox1.Sele ctedIndex >= 0)
{
textBox1.Text = comboBox1.Selec tedItem.ToStrin g();
comboBox1.Selec tionStart = 0;
sAccumulatedCha rs = "";
}
}

private void selectText() {
if(sAccumulated Chars.Length > 0)
{
comboBox1.Selec tionStart = sAccumulatedCha rs.Length;
}
else
{
comboBox1.Selec tionStart = 0;
}
comboBox1.Selec tionLength = comboBox1.Text. Length -
sAccumulatedCha rs.Length;
}

private void button1_Click(o bject sender, System.EventArg s e)
{
Application.Exi t();
}

private void comboBox1_KeyUp (object sender,
System.Windows. Forms.KeyEventA rgs e)
{
e.Handled = true;
}
}
}