Computers / Programming / Mobiles (78)

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27-01-2009 Detecting Idle time or Inactivity in Windows Forms
27-01-2009 Values of Windows API
23-01-2009 PasswordChar and Set focus on page load for ToolStripTextBox
21-01-2009 Capture Form Close Event
21-01-2009 Richtextbox or multiline textbox and AcceptButton to handle Enter or Tab key press
21-01-2009 Key Combination shortcuts in C# Windows Form
01-01-2009 Application Architecture Guide 2 patterns and practices
01-01-2009 Convert string to hexadecimal and hexadecimal to string
31-12-2008 Implementing Transaction in Stored Procedure
31-12-2008 Implementing Transaction in .NET
25-12-2008 Linux environment in Windows
11-12-2008 Facebook Privacy Setting
27-11-2008 Pakistani group hacks Indian websites - Cyber Attack
26-10-2008 Designations...funny!
16-10-2008 Securing Your ASP.NET Web Applications
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14-09-2008 Logo Evolution
13-09-2008 Difference between .NET 2.0/3.0/3.5
03-09-2008 Google launches internet browser
27-08-2008 Excel Shortcuts
16-07-2008 Quantum information technology - Enigma variations
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04-07-2008 Web Service Security using SOAP Extension
24-06-2008 General Web Security Consideration
24-06-2008 ASP.NET Forms Authentication
20-06-2008 Find rowcount, columncount, table size in Sql Server Database
20-06-2008 Developers
19-06-2008 Windows Shortcuts
18-06-2008 Number of Microsoft Certified Professionals Worldwide
16-06-2008 Types of developers
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12-05-2008 Moonlight (Silverlight for Linux)
24-04-2008 Take Advantage of ASP.NET Built-in Features to Fend Off Web Attacks
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16-02-2008 Stealth Deployment
14-02-2008 Resignation letter of a Software Employee
12-02-2008 Development
05-05-2007 Knowledge
Wed 21 Jan 2009

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.

 

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Comments (3)
Wed 21 Jan 2009

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.

 

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Comments (1)
Thu 1 Jan 2009

 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

 

 

 

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Thu 1 Jan 2009

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

 

  

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Wed 31 Dec 2008

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;

Comments here
Wed 31 Dec 2008

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



Private Sub saveThingOne(ByVal conn As OracleConnection) As Boolean
Dim success as Boolean = False
Using comm As New OracleCommand("Save_Thing_One_Stored_Procedure", conn)
   comm.CommandType = CommandType.StoredProcedure
   comm.Parameters.Add("IN_ID", OracleType.Number).Value = intID
   comm.Parameters.Add("IN_THING_ONE", OracleType.VarChar, 60).Value = strThingONe
   comm.Parameters.Add("OUT_RESULT", OracleType.Number).Direction = ParameterDirection.Output
   comm.ExecuteNonQuery()
‘Here if that procedure successfully perform action then will return 0 in case of success and 1 in case of failure
success = Iif(comm.Parameters(“OUT_RESULT”).Value.ToString().equals(“0”), True, False)
Return success
End Using
End Sub



Private Sub saveThingTwo(ByVal conn As OracleConnection)
Dim success as Boolean = False
Using comm As New OracleCommand("Save_Thing_Two_Stored_Procedure", conn)
   comm.CommandType = CommandType.StoredProcedure
   comm.Parameters.Add("IN_ID", OracleType.Number).Value = intID
   comm.Parameters.Add("IN_THING_TWO", OracleType.VarChar, 60).Value = strThingTwo
   comm.Parameters.Add("OUT_RESULT", OracleType.Number).Direction = ParameterDirection.Output
   comm.ExecuteNonQuery()
‘Here if that procedure successfully perform action then will return 0 in case of success and 1 in case of failure
success = Iif(comm.Parameters(“OUT_RESULT”).Value.ToString().equals(“0”), True, False)
Return success

End Using
End Sub

 

 

Comments here
Thu 25 Dec 2008
This is good for those who are interested in linux
 
GNU + Cygnus + Windows = Cygwin
 
Cygwin is a Linux-like environment for Windows
 
 
 
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