In windows form, if you have richtextbox or multiline textbox then usually enter key use to enter a new line.

But if AcceptButton property of Form is set for some action/button press, then pressing enter key in richtextbox or multiline textbox doesn't enter a new line rather AcceptButton calls.

To supress this set the property AcceptsTab to true in richtexbox. In case of multiline textbox / control set AcceptsReturn and AcceptTab property to true.

Tonight in windows form, using C# language I required to use key combination like we use Ctrl+S to save form, CTRL+F to find etc.

In windows form, its quite easy. Just enable KeyPreview property to true. This property makes the form get the key events before the controls, so you can set the KeyPress event on the form.

Form1.KeyPreview = true;

After that, set the form event for the keypress/key down

this.KeyDown += new KeyEventHandler(this.Form1_KeyDown);

Now shortcut part comes here, follow like this

private void Form1_KeyDown(object sender, KeyEventArgs e)
{
 if (Control.ModifierKeys == Keys.Control && e.KeyCode == Keys.S)
 {  
  //SaveData();
 }
 else if (Control.ModifierKeys == Keys.Control && e.KeyCode == Keys.F)
 {  
  //Find();
 }
}

Hope it helps some one.

 Microsoft Application Architecture Guide 2.0‏.  Nice stuff for those who are interested in Application architecture at http://www.codeplex.com/AppArchGuide

Summary :

Parts

Part I, Fundamentals
Part II, Design
Part III, Layers
Part IV, Archetypes

Forewords

  Foreword by S. Somasegar

  Foreword by Scott Guthrie

Chapters

  Introduction

  Architecture and Design Solutions At a Glance

  Fast Track

Part I, Fundamentals

  Chapter 1 - Fundamentals of Application Architecture

  Chapter 2 - .NET Platform Overview

  Chapter 3 - Architecture and Design Guidelines

Part II, Design

  Chapter 4 - Designing Your Architecture

  Chapter 5 - Deployment Patterns

  Chapter 6 - Architectural Styles

  Chapter 7 - Quality Attributes

  Chapter 8 - Communication Guidelines

Part III, Layers

  Chapter 9 - Layers and Tiers

  Chapter 10 - Presentation Layer Guidelines

  Chapter 11 - Business Layer Guidelines

  Chapter 12 - Data Access Layer Guidelines

  Chapter 13 - Service Layer Guidelines

Part IV, Archetypes

  Chapter 14 - Application Archetypes

  Chapter 15 - Web Applications

  Chapter 16 - Rich Internet Applications (RIA)

  Chapter 17 - Rich Client Applications

  Chapter 18 - Services

  Chapter 19 - Mobile Applications

  Chapter 20 - Office Business Applications (OBA)

  Chapter 21 - SharePoint Line-Of-Business (LOB) Applications

Appendix

  Cheat Sheet - patterns & practices Pattern Catalog

  Cheat Sheet - Presentation Technology Matrix

  Cheat Sheet - Data Access Technology Matrix

  Cheat Sheet - Workflow Technology Matrix

  Cheat Sheet - Integration Technology Matrix

Errata Page

  Errata Page

Team

  Core Dev Team: J.D. Meier , Alex Homer, David Hill, Jason Taylor , Prashant Bansode , Lonnie Wall, Rob Boucher Jr, Akshay Bogawat

  Test Team - Rohit Sharma, Praveen Rangarajan, Kashinath TR, Vijaya Jankiraman

  Edit Team - Dennis Rea.

  External Contributors/Reviewers - Adwait Ullal; Andy Eunson; Brian Sletten; Christian Weyer; David Guimbellot; David Ing; David Weller; Derek Greer; Eduardo Jezierski; Evan Hoff; Gajapathi Kannan; Jeremy D. Miller; John Kordyback; Keith Pleas; Kent Corley; Mark Baker; Paul Ballard; Peter Oehlert; Norman Headlam; Ryan Plant; Sam Gentile; Sidney G Pinney; Ted Neward; Udi Dahan

  Microsoft Contributors / Reviewers - Ade Miller; Amit Chopra; Anna Liu; Anoop Gupta; Bob Brumfield; Brad Abrams; Brian Cawelti; Bhushan Nene; Burley Kawasaki; Carl Perry; Chris Keyser; Chris Tavares; Clint Edmonson; Dan Reagan; David Hill; Denny Dayton; Diego Dagum; Dmitri Martynov; Dmitri Ossipov; Don Smith; Dragos Manolescu; Elisa Flasko; Eric Fleck; Erwin van der Valk; Faisal Mohamood; Francis Cheung; Gary Lewis; Glenn Block; Gregory Leake; Ian Ellison-Taylor; Ilia Fortunov; J.R. Arredondo; John deVadoss; Joseph Hofstader; Koby Avital; Loke Uei Tan; Luke Nyswonger; Manish Prabhu; Meghan Perez; Mehran Nikoo; Michael Puleio; Mike Francis; Mike Walker; Mubarak Elamin; Nick Malik; Nobuyuki Akama; Ofer Ashkenazi; Pablo Castro; Pat Helland; Phil Haack; Reed Robison; Rob Tiffany; Ryno Rijnsburger; Scott Hanselman; Seema Ramchandani; Serena Yeoh; Simon Calvert; Srinath Vasireddy; Tom Hollander; Wojtek Kozaczynski

To download go to following link.

http://www.codeplex.com/AppArchGuide

Today I need to convert between string and hexadecimal in C#...

         public string StrToHex(string plainText)
        {
            char[] charArray = plainText.ToCharArray();
            StringBuilder sb = new StringBuilder();
            int num;
            string hex;
            for (int i = 0; i < charArray.Length; i++)
            {
                if (i > 0)
                {
                    sb.Append("-");
                }
                num = Convert.ToInt32(charArray[i]);
                hex = num.ToString("x");
                sb.Append(hex);
            }
             return sb.ToString();
        }

 ===========

         public string HexToStr(string hexaText)
        {
           string[] strArray = hexaText.Split(new char[] { '-' });
            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < strArray.Length; ++i)
            {
                sb.Append((char)Convert.ToInt32(strArray[i], 16));
            }
            return sb.ToString();
        }

 ============ 

Implementation as

string str = "TestString";
string hexStr = StrToHex(str);   // => 54-65-73-74-53-74-72-69-6e-67
str = HexToStr(hexStr); // => TestString

Sample Code Oracle stored procedure - In this simple implementation, call commit at the end of work done, and Rollback if any exception occur.

PROCEDURE SAVE_TWO_THINGS(
IN_THING_ONE IN VARCHAR2,
IN_THING_TWO IN VARCHAR2)
IS

BEGIN

INSERT INTO TABLEONE
(ACTIVE, THING_DESC)
VALUES
('Y', IN_THING_ONE);


INSERT INTO TABLETWO
(ACTIVE, THING_DESC)
VALUES
('N', IN_THING_TWO);

COMMIT;

EXCEPTION WHEN OTHERS THEN 
ROLLBACK;
END;

Today I need to implement transaction in .NET. Front end language was VB.NET and database was Oracle.

This transaction is being implemented using Oracle Data Access Provider - ODP.NET.

Simple implementation is that create and open a connection, begin transaction using that connection, create command using that connection, call stored procedures or statments using command(s), if every thing gone fine and success then call commit of that transaction else rollback, and in last close and dispose connection and transaction.

Be sure not to use commit, rollback or statement that causes transaction invalidate inside the procedure that is being called within .NET transaction, otherwise that .NET transaction scope will no longer valid as within that connection commit or rollback have been called.

Sample code that make my work done is :-

=============

Private Sub Save()
Dim conn As New OracleConnection("ConnString")
Dim trans As OracleTransaction
Dim success as Boolean = False

Try
conn.Open()
 trans = conn.BeginTransaction
success =  saveThingOne(conn)
If success Then
success = saveThingTwo(conn)
End If

If success  Then
 trans.Commit()
else
trans.Rollback()
End If

Catch ex As Exception
 trans.Rollback()
Finally
trans.Dispose()
conn.Close()
conn.Dispose()
End Try
End Sub