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What are the notations used in Evaluation of Arithmetic Expressions using prefix and postfix forms?

Posted By :Shashi Ray     Posted Date :October 22, 2008    Points :10   Category :ASP.Net 
Polish and Reverse Polish notations.

You can also find related Interview Question to What are the notations used in Evaluation of Arithmetic Expressions using prefix and postfix forms?  below: 

Convert the expression ((A + B) * C - (D - E) ^ (F + G)) to equivalent Prefix and Postfix notations.

  
Prefix Notation:
^ - * +ABC - DE + FG

Postfix Notation:
AB + C * DE - - FG + ^ (More...)

What is the prefix and postfix in c#

  
++ and -- operators can be used as prefix and postfix.

Prefix:
num1=3;
num2=++num1 //num1=4, num2=4

The Compiler will first increment num1 by and then will assign it to num2

postfix:
num2=num1++ //num1=4, num2=3

The Compiler will first assign num1 to num2 and then increment num1 by 1

(More...)

What is Query evaluation engine?

  
It executes low-level instruction generated by compiler. (More...)

Forms-Based Authentication

  
Forms-based authentication is used to implement customized logic for authenticating users without having to worry about session management using cookie. It gives developer more access to specify which files on the site can be accessed and by whom, and allows identification of a login page [3,7].
This mechanism will automatically redirect the unauthenticated user to login page and ask them to provide proper credentials (e.g. username/password combination). If login is successful, ASP.NET then issues the cookie to the user and redirects them to specific resources that they originally requested. This cookie allows the user to revisit particular protected resources without having to repeatedly log in.

Shashi Ray (More...)

What is the difference between login controls and Forms authentication?

  
Login controls are an easy way to implement Forms authentication without having to write any code. For example, the Login control performs the same functions you would normally perform when using the FormsAuthentication class—prompt for user credentials, validate them, and issue the authentication ticket—but with all the functionality wrapped in a control that you can just drag from the Toolbox in Visual Studio. Under the covers, the login control uses the FormsAuthentication class (for example, to issue the authentication ticket) and ASP.NET membership (to validate the user credentials). Naturally, you can still use Forms authentication yourself, and applications you have that currently use it will continue to run. (More...)

How you will Hide Column(s) in the Windows Forms DataGridView Control?

  
Set the DataGridViewColumn.Visible property to false.

vb.net:
-------
dataGridView1.Columns("CustomerID").Visible = False

c#.net:
------
dataGridView1.Columns["CustomerID"].Visible = False; (More...)

What is the difference between login controls and Forms authentication?

  
Forms authentication can be easily implemented using login controls without writing any code.
Login control performs functions like prompting for user credentials, validating them and issuing authentication just as the FormsAuthentication class.
However, all that's needs to be dne is to drag and drop the use control from the tool box to have these checks performed implicitly.
The FormsAuthentication class is used in the background for the authentication ticket and ASP.NET membership is used to validate the user credentials. (More...)

What's the safest way to deploy a Windows Forms app?

  
One click deployment through web. We can implement security checking here. (More...)

What is the namespace used for regular expressions?

  
System.Text.RegularExpressions namespace (More...)

What are ASP.NET Web Forms? How is this technology different than what is available though ASP?

  
Web Forms are the heart and soul of ASP.NET. Web Forms are the User Interface (UI) elements that give your Web applications their look and feel. Web Forms are similar to Windows Forms in that they provide properties, methods, and events for the controls that are placed onto them. However, these UI elements render themselves in the appropriate markup language required by the request, e.g. HTML. If you use Microsoft Visual Studio .NET, you will also get the familiar drag-and-drop interface used to create your UI for your Web application. (More...)

I can't seem to find System.Windows.Forms.Integration, where do I find it?

  
The System.Windows.Forms.Integration namespace is defined in WindowsFormsIntegration.dll which currently ships in the WinFX SDK, not in the standard redist. Therefore, the file will be found in "\Program Files\Reference Assemblies\ Microsoft\Avalon\v2.0.50215?. (More...)

Can I use Windows Forms in a WPF application?

  
Yes you can. You can have a WPF application pop a Windows Form much in the same way that you can pop a WPF window from a Windows Forms application. Furthermore, you can place Windows Forms controls side-by-side with WPF controls on a WPF window or page by using the WindowsFormsHost control that will ship as part of the interoperability layer. (More...)

How do I host a WPF control in a Windows Forms application?

  
add references to the WPF namespaces (PresentationCore, PresentationFramework, UIAutomationProvider, UIAutomationTypes, and WindowsBase). Next create an instance of the ElementHost control and the control you wish to embed in the Windows Forms application and then hook that control up to the ElementHost control. Then simply add the ElementHost control to your Forms control collection:

ElementHost host = new ElementHost();

System.Windows.Controls.ListBox wpfListBox = new System.Windows.Controls.ListBox();

for (int i = 0; i < 10; i++)

{

wpfListBox.Items.Add("Item " + i.ToString());

}

host.Dock = DockStyle.Fill;

host.Controls.Add(wpfListBox);

this.panel1.Controls.Add(host);

However, if you want to use XAML to describe the WPF control that you want to use in the Windows Forms application, you would need to add an Avalon UserControl item to your project. This will create a UserControl1.xaml file and a UserControl1.xaml.cs file. You can then modify the UserControl1.xaml file to contain whatever XAML you wish to describe your control. Then you would simply create an instance of this control and add it to the ElementHost control as in the above example:

ElementHost host = new ElementHost();

UserControl1 uc1 = new UserControl1();

host.Controls.Add(uc1);

host.Dock = DockStyle.Fill;

this.panel1.Controls.Add(host);

In addition, you will need to modify the project file because the Windows Application does not what to do with the XAML file. You will need to open the project file (.csproj, .vbproj, etc.) in an editor like Notepad and then scroll to the bottom. You will see the following line:



You will need to copy this line and paste it just below the above line and then change "CSharp" to "WinFX" so that the two lines look like:





Now save this file and reload the project using VS and run the application. (More...)

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