Both perform same action only. Using both we can able to transfer data from one application to another. Using get method we can able to view the information in URL itself, but using post we can able to transfer data over networks, so this is very secure. Post method data we can’t get it directly. But Get method data we can get easily.
We can’t able to transfer bulk of data using GET method. But using post method we can able to transfer bulk of data. Compare to GET method POST method is secure.
Blog that contains articles about new technologies related or not with programming. I will describe and solves some problems that I encounter in my career. ASP .NET, AJAX, Javascript, C++, C# and SQL are some of the subjects that will appear.
18 August 2016
Self-join queries
Self-Join is a type of join which is used to join the same table by creating the second instance of the same table. So we join 2 instances of the same table in case of self-join. This type of join is used when there is the requirement to get the referenced data which is available in the same table.
e.g. A table contains EmpId, Ename and ManagerId
As the manager id is also an employee id. Now if we want that who is the manager of which employee. In this situation, we need to create the instance of the same table and get the required data as:
SELECT EMPID, ENAME, ENAME AS [MANAGER NAME]
FROM EMP E1, EMP E2
WHERE E1.EMPID= E2.MANAGERID
e.g. A table contains EmpId, Ename and ManagerId
As the manager id is also an employee id. Now if we want that who is the manager of which employee. In this situation, we need to create the instance of the same table and get the required data as:
SELECT EMPID, ENAME, ENAME AS [MANAGER NAME]
FROM EMP E1, EMP E2
WHERE E1.EMPID= E2.MANAGERID
Anonymous methods in C#
The concept of anonymous method was introduced in C# 2.0. An anonymous method is inline unnamed method in the code. It is created using the delegate
keyword and doesn’t required name and return type. Hence we can say, an anonymous method has only body without name, optional parameters and return type. An anonymous method behaves like a regular method and allows us to write inline code in place of explicitly named methods.
A Simple Anonymous Method Example
delegate int MathOp(int a, int b);
class Program
{
//delegate for representing anonymous method
delegate int del(int x, int y);
static void Main(string[] args)
{
//anonymous method using delegate keyword
del d1 = delegate(int x, int y) { return x * y; };
int z1 = d1(2, 3);
Console.WriteLine(z1);
}
}
//output:
6
Key points about anonymous method
- A variable, declared outside the anonymous method can be accessed inside the anonymous method.
- A variable, declared inside the anonymous method can’t be accessed outside the anonymous method.
- We use anonymous method in event handling.
- An anonymous method, declared without parenthesis can be assigned to a delegate with any signature.
- Unsafe code can’t be accessed within an anonymous method.
- An anonymous method can’t access the ref or out parameters of an outer scope.
Anonymous Method as an Event Handler
<form id="form1" runat="server">
< div align="center">
<h2>Anonymous Method Example</h2>
<br />
<asp:Label ID="lblmsg" runat="server" ForeColor="Green" Font-Bold="true"></asp:Label>
<br /><br />
<asp:Button ID="btnSubmit" runat="server" Text="Submit" />
<asp:Button ID="btnCancel" runat="server" Text="Cancel" />
</div>
</form>
protected void Page_Load(object sender, EventArgs e)
{
// Click Event handler using Regular method
btnCancel.Click += new EventHandler(ClickEvent);
// Click Event handler using Anonymous method
btnSubmit.Click += delegate { lblmsg.Text=
"Submit Button clicked using Anonymous method"; };
}
protected void ClickEvent(object sender, EventArgs e)
{
lblmsg.Text="Cancel Button clicked using Regular method";
}
11 August 2016
Interview questions
http://pawantechit.blogspot.in/2013/03/interview-question-for-3-6-year.html
http://www.interviewquestionspdf.com/2014/09/aspnet-interview-questions-and-answers.html
https://www.udemy.com/understand-nodejs/
https://www.udemy.com/learn-angularjs/
https://www.udemy.com/design-and-develop-a-killer-website-with-html5-and-css3/
User id : aagrawal ksl
Pwd: password234
http://www.dotnetspider.com/resources/44635-Interview-Questions-3-6-years-experienced-Net-professional.aspx
http://www.aspdotnet-suresh.com/2010/05/interview-questions-in-aspnetcnetsql.html
http://pawantechit.blogspot.in/2013/03/interview-question-for-3-6-year.html
http://pluralsight.com/training/Player?author=scott-allen&name=mvc4-building-m2-controllers&mode=live&clip=0&course=mvc4-building
http://www.dotnet-tricks.com/Tutorial/mvclist
http://www.interviewquestionspdf.com/2014/09/aspnet-interview-questions-and-answers.html
https://www.udemy.com/understand-nodejs/
https://www.udemy.com/learn-angularjs/
https://www.udemy.com/design-and-develop-a-killer-website-with-html5-and-css3/
User id : aagrawal ksl
Pwd: password234
http://www.dotnetspider.com/resources/44635-Interview-Questions-3-6-years-experienced-Net-professional.aspx
http://www.aspdotnet-suresh.com/2010/05/interview-questions-in-aspnetcnetsql.html
http://pawantechit.blogspot.in/2013/03/interview-question-for-3-6-year.html
http://pluralsight.com/training/Player?author=scott-allen&name=mvc4-building-m2-controllers&mode=live&clip=0&course=mvc4-building
http://www.dotnet-tricks.com/Tutorial/mvclist
08 August 2016
Stored procedure vs inline query
Stored procedures are precompiled and cached so the performance is much better.
The choice of choosing stored procedures will not be performance but it will be more from the aspect of security and maintenance. Below are some of the points where stored procedures are definitely a plus over inline SQL.
By putting all your SQL code into a stored procedure, your application is completely abstracted from the field names, tables names, etc. So when you make changes in the SQL, you have less impact in your C# code.
This is the best part where stored procedures again score, you can assign execution rights on users and roles.
Now because we have centralized our stored procedures any issue like fixing defects and other changes can be easily done in a stored procedure and it will be reflected across the installed clients. At least we do not need to compile and deploy DLLs and EXEs.
If we know we have a slow running stored procedure, we can isolate it and the DBA guys can performance tune it separately.
Simple TSQLs are OK. But what if you have a bunch of statements with IF, ELSE, Cursors, etc? For those kind of scenarios, again stored procedures are very handy.
The choice of choosing stored procedures will not be performance but it will be more from the aspect of security and maintenance. Below are some of the points where stored procedures are definitely a plus over inline SQL.
Abstraction
By putting all your SQL code into a stored procedure, your application is completely abstracted from the field names, tables names, etc. So when you make changes in the SQL, you have less impact in your C# code.
Security
This is the best part where stored procedures again score, you can assign execution rights on users and roles.
Maintenance ease
Now because we have centralized our stored procedures any issue like fixing defects and other changes can be easily done in a stored procedure and it will be reflected across the installed clients. At least we do not need to compile and deploy DLLs and EXEs.
Centralized tuning
If we know we have a slow running stored procedure, we can isolate it and the DBA guys can performance tune it separately.
Cursors, temp table complications
Simple TSQLs are OK. But what if you have a bunch of statements with IF, ELSE, Cursors, etc? For those kind of scenarios, again stored procedures are very handy.
06 August 2016
State management
A new instance of the Web page class is created each time the page is posted to the server. In traditional Web programming, this would typically mean that all information associated with the page and the controls on the page would be lost with each round trip.
To overcome this inherent limitation of traditional Web programming, ASP.NET includes several options. These features are as follows:
https://msdn.microsoft.com/en-us/library/75x4ha6s.aspx
To overcome this inherent limitation of traditional Web programming, ASP.NET includes several options. These features are as follows:
- View state
- Control state
- Hidden fields
- Cookies
- Query strings
- Application state
- Session state
- Profile Properties
https://msdn.microsoft.com/en-us/library/75x4ha6s.aspx
return types in mvc
Return View
This is a most common and very frequently used type. We see that we can pass eight parameters when we return the view. We can specify the view name explicitly or may not.
Return partial View
The concept of a partial view is very similar to the master page concept in Web Form applications. The partial view is nothing but pagelet, that we can return from the controller and that merges with the main view and generates one concrete HTML page.
It may take 4 parameters to render in the partial view.
Redirect
This is equivalent to Response.redirect() or Server.Transfer() functions. It takes the URL path to be redirect , though we can use Response.Redirect() or Server.Transfer() in MVC too.
Redirect To Action
Sometimes it is necessary to call another action after completion of one action, this is very similar to a function call in traditional function oriented programming or Object Oriented Programming. It may take 6 parameters. The first parameter is very simple, only action name.
Return content
This is useful when we want to return a small amount of strings from a controller/action. It takes three parameters. The first one is a simple string and the remaining two are strings with little information.
Return JSON
This is very useful when we don't want an entire HTML page but only want a value. Generally in AJAX-based single-page applications we do not load an entire page again and again but load fresh data from the DB using AJAX. In this scenario we can return only a JSON object and in the success function of jQuery ajax (let's assume we are using the jQuery library to implement AJAX) we can just manipulate data.
Return JavaScript
When we wanted to return a JavaScript string , we may use this function. It takes only one parameter, the string only.
Return File
We are allowed to return a binary file if needed from a controller. It takes 6 parameters maximum.
This is a most common and very frequently used type. We see that we can pass eight parameters when we return the view. We can specify the view name explicitly or may not.
Return partial View
The concept of a partial view is very similar to the master page concept in Web Form applications. The partial view is nothing but pagelet, that we can return from the controller and that merges with the main view and generates one concrete HTML page.
It may take 4 parameters to render in the partial view.
Redirect
This is equivalent to Response.redirect() or Server.Transfer() functions. It takes the URL path to be redirect , though we can use Response.Redirect() or Server.Transfer() in MVC too.
Redirect To Action
Sometimes it is necessary to call another action after completion of one action, this is very similar to a function call in traditional function oriented programming or Object Oriented Programming. It may take 6 parameters. The first parameter is very simple, only action name.
Return content
This is useful when we want to return a small amount of strings from a controller/action. It takes three parameters. The first one is a simple string and the remaining two are strings with little information.
Return JSON
This is very useful when we don't want an entire HTML page but only want a value. Generally in AJAX-based single-page applications we do not load an entire page again and again but load fresh data from the DB using AJAX. In this scenario we can return only a JSON object and in the success function of jQuery ajax (let's assume we are using the jQuery library to implement AJAX) we can just manipulate data.
Return JavaScript
When we wanted to return a JavaScript string , we may use this function. It takes only one parameter, the string only.
Return File
We are allowed to return a binary file if needed from a controller. It takes 6 parameters maximum.
user control vs custom control in c#
Custom Control | User Control |
A loosely coupled control w.r.t code and UI | A tightly coupled control w.r.t code and UI |
Derives from Control | Derives from UserControl |
Defines UI in a ResourceDictionary | Defines UI as normal XAML |
UI is skinable | Child controls are skinable |
Has dynamic layout | Has static layout |
UI can be changed in different projects | UI is fixed and can't have different looks in different project |
Has full toolbox support, Jst drag n drop from toolbox | Can't be added to the toolbox, Jst drag n drop from sol’n explorer to page(aspx) |
Defines a single control | Defines a set of controls |
More flexible | Not very flexible like a Custom Control |
Reusability of control (extend functionality of existing control), Designed so that it can be used by more than one application | Reusability web page, Designed for single-application scenarios |
Compiled into dll | Not compiled into dll |
Creation is similar to the way Web Forms pages are created; well-suited for rapid application development (RAD) | Writing involves lots of code because there is no designer support |
Button
, CheckBox
, TextBox
etc., even a UserControl
is nothing but a Custom Control. You can easily load them inside a XAML page.Custom Controls are compiled into a DLL assembly and can be reused in multiple places very easily. You have total control over the code, thus gives you more flexibility to extend the behaviour. Once you build and add a reference of the custom control in your project, you can find it in the toolbox. Thus, you will be able to drag and drop the control in your Design view and start working with it very easily.
- When you have a rapid and fixed content in your UI, use UserControl.
- When you want to separate some basic functionality of your main view to some smaller pieces with reusability, use UserControl.
- When you want to use your control in different projects and each project may want to change the look, use CustomControl.
- When you want to implement some additional functionality for a control, create a CustomControl derived from the base control.
- When you want to apply themes to your controls, use CustomControl.
- When you want to add toolbox support for your control, so that your user will be able to do drag and drop to the designer, use CustomControl.
For user control:
<%@ Register TagPrefix="UC" TagName="TestControl" Src="test.ascx" %>
For custom control:
<%@ Register TagPrefix="CC " Namespace=" CustomServerControlsLib " Assembly="CustomServerControlsLib " %>
05 August 2016
Linq query on datatable
var results = from myRow in myDataTable.AsEnumerable()
where myRow.Field<int>("RowNo") == 1
select myRow;
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