Windows Phone Developers

Wednesday, March 31, 2010

System.IO.FileNotFoundException was unhandled

The error occurs when an attempt is made to open a file that is not available

The following statement

stream = File.Open("data.xml", FileMode.Open);

will throw an error if data.xml is not available
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Program '..Sample.exe' has more than one entry point defined: '..Program.Main()'. Compile with /main to specify the type that contains the entry poin

Program '..Sample.exe' has more than one entry point defined: '..Program.Main()'. Compile with /main to specify the type that contains the entry point.

This error occurs when there are two Sub Main() functions in a solution Digg Technorati Delicious StumbleUpon Reddit BlinkList Furl Mixx Facebook Google Bookmark Yahoo
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The type or namespace name 'SoapFormatter' could not be found (are you missing a using directive or an assembly reference?)

The type or namespace name 'Soap' does not exist in the namespace 'System.Runtime.Serialization.Formatters' (are you missing an assembly reference?)



The type or namespace name 'SoapFormatter' could not be found (are you missing a using directive or an assembly reference?)

Add the following reference to the project to solve the error

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Tuesday, March 30, 2010

Accessors and mutators in C#

Accessors and mutators do the job of retrieving and storing the data to a class member. The class member will be usually private and hence cannot be accessed directly by the object.

The following code provides a hint of the same



public enum playerType { ClassA, ClassB, ClassC, Contract }
private playerType _PlayerType;
string Name;
string Age;
string Phone;


#endregion

#region properties
public playerType PlayerType
{
//accessor
get { return _PlayerType; }

//mutator
set
{
_PlayerType = value;
}

}


Here _PlayerType is declared as private. This can be however accessed in the main program as shown below:


ClassTeam CT = new ClassTeam();
CT.PlayerType = ClassTeam.playerType.Contract; //Calls the Mutator
MessageBox.Show(CT.PlayerType.ToString()); // Calls the Accessor


The statement CT.PlayerType = ClassTeam.playerType.Contract; Calls the Mutator (set property) and sets the value and CT.PlayerType.ToString() uses Get property and retrieves the value Digg Technorati Delicious StumbleUpon Reddit BlinkList Furl Mixx Facebook Google Bookmark Yahoo
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System.StackOverflowException was unhandled - Set Property C#

Set Property C# goes to infinite loop

If the set property goes to infinite loop, then there is some problem with accessor and mutator.

The following example is a good (rather bad) for recursive looping of the properties


public playerType PlayerType
{
get { return PlayerType; }

set
{
PlayerType = value;
}

}





In order to correct it, declare a private variable and get/set that variable.



private playerType _PlayerType;

public playerType PlayerType
{
get { return _PlayerType; }

set
{
_PlayerType = value;
}

}

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Monday, March 29, 2010

Your step-into request resulted in an automatic step-over of a property or operator.

Your step-into request resulted in an automatic step-over of a property or operator.

This behavior can be overridden in the context menu for the line being executed by choosing 'Step Into Specific' or by unchecking the option 'Step over properties and operators'.

Do you want to continue being notified when an automatic step-over happens?

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Sunday, March 28, 2010

How to effectively use #region in Visual Studio

#region lets you specify a block of code that you can expand or collapse when using the outlining feature of the Visual Studio Code Editor.

The collapse and expand feature can be used for advantage with good declaration of regions

For example:


namespace BlogExample_WinAppOne
{
class ClassTeam
{
#region declarations
public enum playerType { ClassA, ClassB, ClassC, Contract }
#endregion

#region properties
public playerType PlayerType
{
get { return PlayerType; }

set
{
PlayerType = value;
}

}


#endregion

#region public methods
public string SetPlayer
{

}
#endregion
}
}



Would look like the following when collapsed:




Please share your thoughts on effective usage of #region Digg Technorati Delicious StumbleUpon Reddit BlinkList Furl Mixx Facebook Google Bookmark Yahoo
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Invalid expression term '>'


Only assignment, call, increment, decrement, and new object expressions can be used as a statement

Invalid expression term '>'

The error is most likely for some VB programmer coding C#. The following snippet shows you why:

Wrong

if (value.Length <> 0)



Correct

if (value.Length != 0)

or

if (value.Length > 0)



VB Programmers tend to use <>:) Digg Technorati Delicious StumbleUpon Reddit BlinkList Furl Mixx Facebook Google Bookmark Yahoo
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Semicolon after method or accessor block is not valid

Semicolon after method or accessor block is not valid error is thrown when the semicolon is not appropriately placed.




For example


set { PlayerType = value };


should be


set { PlayerType = value; }


You can post your own examples for helping readers Digg Technorati Delicious StumbleUpon Reddit BlinkList Furl Mixx Facebook Google Bookmark Yahoo
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Saturday, March 27, 2010

Enumeration in C#

Here is a simple way to declare and use enumerations

Declaration is by using the enum keyword


public enum playerType { ClassA, ClassB, ClassC, Contract }



And you can use as shown below:


ClassTeam CT = new ClassTeam();
CT.PlayerType = ClassTeam.playerType.Contract;

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Partial Classes in C# (.NET)






Why to use Partial Classes?



Partial classes have many advantages. The most visible being the ability to split the class in multiple files. This is quite evident in Windows forms.


Windows forms has the class being split between two files - Form1.cs and FormDesigner.cs


Windows Forms application

partial class

Form1

{

///

/// Required designer variable.

///

private System.ComponentModel.IContainer components = null

;



And

public partial class

Form1 : Form

{

public

Form1()

{

check_whitespace();

InitializeComponent();

}

The same concept can be effectively used in the classes you create also.

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A namespace does not directly contain members such as fields or methods

Inside a namespace, the compiler only accepts classes, structures, unions, enumerations, interfaces, and delegates. If you have declared any methods directly in namespace (i.e, outside a class/strucutre) the following error occurs


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A using clause must precede all other elements defined in the namespace except extern alias declarations

A using clause must precede all other elements defined in the namespace except extern alias declarations error occurs when the using class is not defined at the beginning.

class

PSample

{

}

}

using

System;

using

System.Collections.

Generic;

using

System.

Linq;

using

System.

Text;



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