| Page Item | Value |
| Title | Generating Random Numbers in the .NET Framework |
| Description | Describes how to generate random integer and floating point numbers using Microsoft's .NET Framework. Code samples are supplied in both VB.NET and C# |
| Keywords | asp.net, random, next, nextdouble, generator, generated, csharp, c#, asp.net, vb, visual basic, visual basic.net |
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Home ASP.NET Articles Generating Random Numbers in the .NET Framework Random numbers may be generated in the .NET Framework by making use of the Random class. This class may be instantiated using the following code: //Create a new Random class in C# Random RandomClass = new Random(); 'Create a new Random class in VB.NET Dim RandomClass As New Random() Random Integers Once the class has been instantiated, a random integer can be obtained by calling the Next method of the Random class: //C# int RandomNumber = RandomClass.Next(); 'VB.NET Dim RandomNumber As Integer RandomNumber = RandomClass.Next() The value of RandomNumber will, therefore, be assigned a random whole number between 1 and 2,147,483,647. In most coding situations, it is more desirable to create a random number within a certain size range. In this case, the Next method should be called with two arguments: the minimum value and the maximum value. For example, the following assigns RandomNumber to a value that is greater or equal to 4 and less than 14: //C# int RandomNumber = RandomClass.Next(4, 14); 'VB.NET Dim RandomNumber As Integer RandomNumber = RandomClass.Next(4, 14) Note that an ArgumentOutOfRangeException will be raised if the minimum value is larger than the maximum value. It is also possible to specify just the maximum value using a different constructor. The following will return a return a random integer that is greater or equal to 0 and less than 14: //C# int RandomNumber = RandomClass.Next(14); 'VB.NET Dim RandomNumber As Integer RandomNumber = RandomClass.Next(14) Again, an ArgumentOutOfRangeException will be raised if the maximum value is smaller than 0. Random Floating Point Numbers As well as returning random integers, the Random class can also return floating point numbers. The NextDouble method returns a random number as a Double . The random number's value is always greater or equal to 0.0, and less than 1.0: //Create a random double using C# double RandomNumber = RandomClass.NextDouble(); 'Create a random double using VB.NET Dim RandomNumber As Double RandomNumber = RandomClass.NextDouble() Useful Development Tools ASP Documentation Tool Automatically creates developer documentation for ASP 2.0 and 3.0 web applications written in VBScript and JScript. Documentation for Microsoft Access, SQL Server 7/2000 databases and Visual Basic 6.0 components associated with the web application can also be incorporated into the reports. Documentation is created in HTML, HTML Help and plain text formats. View Sample Output (HTML Help format). View Sample Output (HTML Format). Download Trial Version (5.2Mb ZIP file). ASP.NET Documentation Tool Automatically creates developer documentation for ASP.NET web applications written in C# or VB.NET. Documentation for SQL Server 7/2000 databases and C#/VB.NET components associated with the web application can also be incorporated into the reports. Documentation is created in HTML, HTML Help and plain text formats. View Sample Output (HTML Help format). View Sample Output (HTML Format). Download Trial Version (2.9Mb ZIP file). SQL Documentation Tool The SQL Documentation Tool creates technical documentation for Microsoft SQL Server 7.0 and 2000 databases. Technical documentation is created in HTML and HTML Help formats. The HTML Help format documentation is fully searchable and cross referenced. The SQL Documentation Tool documents SQL Server Tables, Views, Stored Procedures, Triggers and Table Relationships. View Sample Output (HTML Help format). View Sample Output (HTML Format). Download Trial Version (10.3Mb ZIP file). Index Server Companion The Index Server Companion is a Windows application that extends the functionality of Microsoft Index Server so that it is able to index content from remote websites and also from ODBC databases. As such it can be used as a low cost alternative to Site Server 3.0 Search. View Product Documentation (119K ZIP file). Try Sample Search Facility . Download Trial Version (1.7Mb ZIP file). The Website Utility The Website Utility examines websites for errors and areas that need to be optimised for search engines by using a built in web crawling engine. Errors checked for include broken or moved hyperlinks, missing page titles and missing meta tags. It also generates HTML for use in creating website site maps (table of contents pages - like this one ), and is able to create both client-side JavaScript Search Engines and server-side ASP Search Engines for a website. View Sample Output (HTML Help format). View Sample Output (HTML Format). Download Trial Version (3Mb ZIP file). Site Map All content is © 1995 - 2006 Brett Burridge |
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