Brocade Communications Most Frequently Asked ASP.NET MVC Interview Questions Answers
How To Change The Action Name In Asp.net Mvc?
"ActionName" attribute can be used for changing the action name.
Below is the sample code snippet to demonstrate more
[ActionName("TestActionNew")]
public ActionResult TestAction()
{
return View();
}
So in the above code snippet "TestAction" is the original action name and in "ActionName" attribute, name - "TestActionNew" is given. So the caller of this action method will use the name "TestActionNew" to call this action.
What Are Code Blocks In Views?
Unlike code expressions that are evaluated and sent to the response, it is the blocks of code that are executed. This is useful for declaring variables which we may be required to be used later.
@{
int x = 123;
string y = "aa";
}
What Is The "helper Page.isajax" Property?
The Helper Page.IsAjax property gets a value that indicates whether Ajax is being used during the request of the Web page.
Can You Explain Renderbody And Renderpage In Asp.net Mvc?
RenderBody is like ContentPlaceHolder in web forms. This will exist in layout page and it will render the child pages/views. Layout page will have only one RenderBody() method. RenderPage also exists in Layout page and multiple RenderPage() can be there in Layout page.
What Is Viewstart Page In Asp.net Mvc?
This page is used to make sure common layout page will be used for multiple views. Code written in this file will be executed first when application is being loaded.
Explain The Methods Used To Render The Views In Asp.net Mvc?
Below are the methods used to render the views from action -
View() : To return the view from action.
PartialView() : To return the partial view from action.
RedirectToAction() : To Redirect to different action which can be in same controller or in different controller.
Redirect() : Similar to "Response.Redirect()" in webforms, used to redirect to specified URL.
RedirectToRoute() : Redirect to action from the specified URL but URL in the route table has been matched.
What Are The Sub Types Of Actionresult?
ActionResult is used to represent the action method result. Below are the subtypes of ActionResult
ViewResult
PartialViewResult
RedirectToRouteResult
RedirectResult
JavascriptResult
JSONResult
FileResult
HTTPStatusCodeResult
What Are Non Action Methods In Asp.net Mvc?
In ASP.Net MVC all public methods have been treated as Actions. So if you are creating a method and if you do not want to use it as an action method then the method has to be decorated with "NonAction" attribute as shown below
[NonAction]
public void TestMethod()
{
// Method logic
}
How We Can Call A Javascript Function On The Change Of A Dropdown List In Asp.net Mvc?
Create a JavaScript method
function DrpIndexChanged() { } Invoke the method
< %:Html.DropDownListFor(x => x.SelectedProduct, new SelectList(Model.Customers, "Value", "Text"), "Please Select a Customer", new { id = "ddlCustomers", onchange=" DrpIndexChanged ()" })%>
What Are Validation Annotations?
Data annotations are attributes which can be found in the "System.ComponentModel.DataAnnotations" namespace. These attributes will be used for server-side validation and client-side validation is also supported. Four attributes - Required, String Length, Regular Expression and Range are used to cover the common validation scenarios.
Why To Use Html.partial In Asp.net Mvc?
This method is used to render the specified partial view as an HTML string. This method does not depend on any action methods.
We can use this like below
@Html.Partial("TestPartialView")
What Is The Need Of Action Filters In Asp.net Mvc?
Action Filters allow us to execute the code before or after action has been executed. This can be done by decorating the action methods of controls with ASP.Net MVC attributes.
Mention Some Action Filters Which Are Used Regularly In Asp.net Mvc?
Below are some action filters used
Authentication
Authorization
HandleError
OutputCache
How Can We Determine Action Invoked From Http Get Or Http Post?
This can be done in following way : Use class : "HttpRequestBase" and use the method : "HttpMethod" to determine the action request type.
In Server How To Check Whether Model Has Error Or Not In Asp.net Mvc?
This can be done in following way : Use class : "HttpRequestBase" and use the method : "HttpMethod" to determine the action request type.
How To Change The Action Name In Asp.net Mvc?
"ActionName" attribute can be used for changing the action name.
Below is the sample code snippet to demonstrate more
[ActionName("TestActionNew")]
public ActionResult TestAction()
{
return View();
}
So in the above code snippet "TestAction" is the original action name and in "ActionName" attribute, name - "TestActionNew" is given. So the caller of this action method will use the name "TestActionNew" to call this action.
What Are Code Blocks In Views?
Unlike code expressions that are evaluated and sent to the response, it is the blocks of code that are executed. This is useful for declaring variables which we may be required to be used later.
@{
int x = 123;
string y = "aa";
}
What Is The "helper Page.isajax" Property?
The Helper Page.IsAjax property gets a value that indicates whether Ajax is being used during the request of the Web page.
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| Brocade Communications Most Frequently Asked ASP.NET MVC Interview Questions Answers |
Can You Explain Renderbody And Renderpage In Asp.net Mvc?
RenderBody is like ContentPlaceHolder in web forms. This will exist in layout page and it will render the child pages/views. Layout page will have only one RenderBody() method. RenderPage also exists in Layout page and multiple RenderPage() can be there in Layout page.
What Is Viewstart Page In Asp.net Mvc?
This page is used to make sure common layout page will be used for multiple views. Code written in this file will be executed first when application is being loaded.
Explain The Methods Used To Render The Views In Asp.net Mvc?
Below are the methods used to render the views from action -
View() : To return the view from action.
PartialView() : To return the partial view from action.
RedirectToAction() : To Redirect to different action which can be in same controller or in different controller.
Redirect() : Similar to "Response.Redirect()" in webforms, used to redirect to specified URL.
RedirectToRoute() : Redirect to action from the specified URL but URL in the route table has been matched.
What Are The Sub Types Of Actionresult?
ActionResult is used to represent the action method result. Below are the subtypes of ActionResult
ViewResult
PartialViewResult
RedirectToRouteResult
RedirectResult
JavascriptResult
JSONResult
FileResult
HTTPStatusCodeResult
What Are Non Action Methods In Asp.net Mvc?
In ASP.Net MVC all public methods have been treated as Actions. So if you are creating a method and if you do not want to use it as an action method then the method has to be decorated with "NonAction" attribute as shown below
[NonAction]
public void TestMethod()
{
// Method logic
}
How We Can Call A Javascript Function On The Change Of A Dropdown List In Asp.net Mvc?
Create a JavaScript method
function DrpIndexChanged() { } Invoke the method
< %:Html.DropDownListFor(x => x.SelectedProduct, new SelectList(Model.Customers, "Value", "Text"), "Please Select a Customer", new { id = "ddlCustomers", onchange=" DrpIndexChanged ()" })%>
What Are Validation Annotations?
Data annotations are attributes which can be found in the "System.ComponentModel.DataAnnotations" namespace. These attributes will be used for server-side validation and client-side validation is also supported. Four attributes - Required, String Length, Regular Expression and Range are used to cover the common validation scenarios.
Why To Use Html.partial In Asp.net Mvc?
This method is used to render the specified partial view as an HTML string. This method does not depend on any action methods.
We can use this like below
@Html.Partial("TestPartialView")
What Is The Need Of Action Filters In Asp.net Mvc?
Action Filters allow us to execute the code before or after action has been executed. This can be done by decorating the action methods of controls with ASP.Net MVC attributes.
Mention Some Action Filters Which Are Used Regularly In Asp.net Mvc?
Below are some action filters used
Authentication
Authorization
HandleError
OutputCache
How Can We Determine Action Invoked From Http Get Or Http Post?
This can be done in following way : Use class : "HttpRequestBase" and use the method : "HttpMethod" to determine the action request type.
In Server How To Check Whether Model Has Error Or Not In Asp.net Mvc?
This can be done in following way : Use class : "HttpRequestBase" and use the method : "HttpMethod" to determine the action request type.
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