Stopwatch class to determine the execution time for an application

A Stopwatch instance can measure elapsed time for one interval, or the total of elapsed time across multiple intervals. In a typical Stopwatch scenario, you call the Start method, then eventually call the Stop method, and then you check elapsed time using the Elapsed property.

If you want to measure the time required for your programs written in the C# language. This could be for a micro-benchmark or for routine and continuous performance monitoring.

Example

First sample:
In this sample you must create Stopwatch as an instance. This makes it useful in multithreaded applications or websites.

using System;
using System.Diagnostics;
using System.Threading;
class Program
{
static void Main(string[] args)
{
Stopwatch stopWatch = new Stopwatch();
stopWatch.Start();
Thread.Sleep(10000);//or do some work
stopWatch.Stop();
// Get the elapsed time as a TimeSpan value.
TimeSpan ts = stopWatch.Elapsed;

// Format and display the TimeSpan value.
string elapsedTime = String.Format("{0:00}:{1:00}:{2:00}.{3:00}",
ts.Hours, ts.Minutes, ts.Seconds,
ts.Milliseconds / 10);
Console.WriteLine("RunTime " + elapsedTime);
}
}

Second sample:
In this sample we use the StartNew method. This uses a creational design pattern to return a new instance from a static type method. It eliminates typing and simplifies your code.

class Program
{
static void Main(string[] args)
{
// Create new stopwatch
var stopwatch = System.Diagnostics.Stopwatch.StartNew();

// Do something

// Stop timing
stopwatch.Stop();

// Write the results
TimeSpan ts = stopWatch.Elapsed;

// Format and display the TimeSpan value.
string elapsedTime = String.Format("{0:00}:{1:00}:{2:00}.{3:00}",
ts.Hours, ts.Minutes, ts.Seconds,
ts.Milliseconds / 10);
Console.WriteLine("RunTime " + elapsedTime);
}
}

For more details please visits here.

SQL Server case/when type conversion problem

In my last project I wrote a query where I have to sort data based on the user input but each column in table has different data type. So to meet with this type of requirement I have used case..when block of the sql server.


Problem: Sample query

DECLARE @sortby Varchar(10)
Set @sortby = 'A1'

Select String1,String2,DateCol
from (
select 'A1','B1', GetDateTime()
union
select 'A2','B2', GetDateTime()
) As d(String1,String2,DateCol)
Order by
Case
When @sortby = 'A1' then String2
When @sortby = 'B1' then String1
When @sortby = 'Date' then Date1
End

there is not syntax error when you check for the syntax error but when execute code you find there is error

ERROR:Conversion failed when converting datetime from character string.

the problem here is first two having databype Varchar and last one having datatype DateTime. So when you executing its found that one branch having datetime so its gives error even its not executing that.

Solution

First Solution
So to avoid this problem you require to convert dateTime to the string

DECLARE @sortby Varchar(10)
Set @sortby = 'A1'
Select String1,String2,DateCol
from (
select 'A1','B1', GetDateTime()
union
select 'A2','B2', GetDateTime()
) As d(String1,String2,DateCol)
Order by
Case
When @sortby = 'A1' then String2
When @sortby = 'B1' then String1
When @sortby = 'Date' then Cast(Date1 as varchar(20))
End


Second Solution
Divide the Case when in multiple statement

DECLARE @sortby Varchar(10)
Set @sortby = 'A1'

Select String1,String2,DateCol
from (
select 'A1','B1', GetDateTime()
union
select 'A2','B2', GetDateTime()
) As d(String1,String2,DateCol)
Order by
Case When @sortby = 'A1' then String2 End,
Case When @sortby = 'B1' then String1 End,
Case When @sortby = 'Date' then Date1 End

Html stripper (Remove Html tag)

This is a common problem when we want to show any data in gridview(asp.net) or table or repeater it breaks the page or design of the page due to html tag inside the presented date.

It will also cause the problem if we want use CKEDITOR to insert data. Because when we insert anything using rich editor it is wrap the text with <p></p>. If we want to show partial of the string it will cause page break because last </p> is missing.

So to avoid this problem we need to strip the Html tag from the string. We can do it in various ways such as regular expression and character array.

Solution 1(Good):

using System.Text.RegularExpressions;
//Remove HTML from string with Regex.
public static string StripTagsRegex(string source)
{
return Regex.Replace(source, "<.*?>", string.Empty);
}


Solution 2(Better):

using System.Text.RegularExpressions;
// Compiled regular expression for performance.
static Regex _htmlRegex = new Regex("<.*?>", RegexOptions.Compiled);

// Remove HTML from string with compiled Regex.
public static string StripTagsRegexCompiled(string source)
{
return _htmlRegex.Replace(source, string.Empty);
}

Solution 3:(Best)

//Remove HTML tags from string using char array.
public static string StripTagsCharArray(string source)
{
char[] array = new char[source.Length];
int arrayIndex = 0;
bool inside = false;

for (int i = 0; i < source.Length; i++) { char let = source[i]; if (let == '<') { inside = true; continue; } if (let == '>')
{
inside = false;
continue;
}
if (!inside)
{
array[arrayIndex] = let;
arrayIndex++;
}
}
return new string(array, 0, arrayIndex);
}

Fixed problem for continuous string(long string without space) using regular expression

Last day I have faced a problem for a long string like(adfdsfsdfdsfdsfsdafdsfsdfsdfsdfsdfsdfsdfsdfsdffdsfsdfsdfsdafsdfsdfsdfsdfsdfsdafsdf) which make my application's UI design break. So to fixed this issue I have used regular expression which insert a space after n characters.

To insert a space after every n characters:

var newString = Regex.Replace(oldString, new string('.', n), m => m.Value + " ");

Sample solution:
string longWord = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaassssssssssssssssssssssssdddddddddddddddddddddddddddddaaaaaaaaaafffffffffffffffffffffffffadfdsfsdfdsfdsfsdafdsfsdfsdfsdfsdfsdfsdfsdfsdffdsfsdfsdfsdafsdfsdfsdfsdfsdfsdafsdffdsfdsfdsfsdf";

Regex.Replace(longWord, new string('.', 16), m => m.Value + " ");

In above image it shows that regex place a space after every 16 character for that long string.

JavaScript parseInt() bug

Very recently I have faced a strange problem with JavaScript parseInt() function. It returns incorrect result when try to parse value like "08","09"...... But it works for "01" to "07".
So I have tried to find solution in community. Then find that this was a JavaScript bug.

Problem:

There is a "bug" with the parseInt JavaScript function. The bug is not something that will affect you very often, but it is something you should be aware of. We've seen the bug in every browser except Opera.

I've created a button to demonstrate the bug. The bug is that parseInt can return an incorrect value. For example, parseInt("08") results in 0 instead of 8. And parseInt("09") results in 0 instead of 9. The reason for this is because the zero in front is trying to tell the browser that this is an octal (base 8) number, and "08" and "09" are not valid octal numbers. The button below builds statements from parseInt("01") through parseInt("09") and shows what the resulting value is. But it also does parseFloat("01") through parseFloat("09"). This shows that the bug does not exist with parseFloat.

Solution:

parseInt(parseFloat(09))
Or,
parseInt(09, 10)
The "10" in the second example tells the browser that base-10 values should be used.

Hope that it will helpful for other developers.Thanks.

Creating a SOLID Visual Studio Solution - Steven Smith

I found this article really a very important for developer. So I would like to share this with you. Hope that it may help you for better development.

The SOLID acronym describes five object-oriented design principles that, when followed, produce code that is cleaner and more maintainable. The last principle, the Dependency Inversion Principle, suggests that details depend upon abstractions. Unfortunately, typical project relationships in .NET applications can make this principle difficult to follow.

In this article, describe how one can structure a set of projects in a Visual Studio solution such that DIP can be followed, allowing for the creation of a SOLID solution......

For more details please visits: Creating a SOLID Visual Studio Solution

"System.Security.SecurityException: Security error" error message when the virtual directory points to a remote share in ASP.NET

Very recently I have faced a problem when hosting a web application in hosting server. This application is running perfectly on local PC but security exceptions occurs when hosting to a server.

Problem
I have got the following error message:

Security Exception Description: The application attempted to perform an operation not allowed by the security policy. To grant this application the required permission please contact your system administrator or change the application's trust level in the configuration file.

Exception Details: System.Security.SecurityException: Security error.

After consult with senior guys they refer the solution which is sharing with you.

Main Cause

The System.Web namespace does not have the AllowPartiallyTrustedCallersAttribute applied to it.

Any code that is not in the My_Computer_Zone code group that does not have this attribute requires the FullTrust user right. Therefore, the remote share that holds the Web applications content requires FullTrust.

Solution

To resolve this behavior, grant the FullTrust right to the remote share:

1.On the Web server, open Administrative Tools, and then double-click Microsoft .NET Framework Configuration.
2.Expand Runtime Security Policy, expand Machine, and then expand Code Groups.
3.Right-click All_Code, and then click New.
4.Select Create a new code group. Give your code group a relevant name, such as the name of the applications share. Click Next.
5.In the Choose the condition type for this code group list, select URL.
6.In the URL box, type the path of the share in the following format:
file:////\\computername\sharename\*
7.Note Replace computername with the name of the computer that is hosting the remote share. Replace sharename with the name of the share.
8.Click Next. On the next page, select Use an existing permission set, and then select FullTrust.
9.Click Next, and then click Finish.

Restart Microsoft Internet Information Services (IIS) to restart the ASP.NET worker process.

If Microsoft .NET Framework Configuration is not displayed under Administrative Tools, you can install the .NET Framework SDK to add Microsoft .NET Framework Configuration.

Alternatively, you can run the following command to make the change:

Drive:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\caspol.exe -m -ag 1 -url "file:////\\computername\sharename\*" FullTrust -exclusive on