C# .Net 2005 Code Helper


	Computer Science 213

C# Code Snippets for Visual Studio

When you need code for a specific job, then check out this list. Instead of scrounging around in your notes, I put some major code snippets here for you. In most cases they are copied from our C# classroom projects.

Forms	Change form background color or change form size at run time. Make ENTER key work like TAB How to launch a browser & go to URL
Data Entry	Managing Data Entry Issues Copy selected item in Listbox to a textbox How to concatenate strings Simple math operations (computing sales tax) How to display items & pricing as currency Data Validation How to use the ErrorProvider component Use the KeyDown & KeyPress events in validation Trapping user keystrokes Regular Expressions Some useful expressions
Event Handlers	Event Handler for Multiple Controls Handle multiple radio buttons in one click event
Using Control Arrays & Lists	Creating Lists<> from Disk file data
Using List Boxes	Add Item to list box Remove list box item Load list box with items & pricing information at design time Load List Box with Items & Pricing at run time Getting the list box items, pricing, & photo information Foreach Loop and listboxes Multi-select List boxes & For Loop Using two list boxes to select items
Menus & Windows Dialog Boxes	Using Drop-Down menus and Windows dialogs Using OpenFile Dialog Box
Using Controls	Web Browser control How to display image in a picture box
If , Switch, & Loops	Making Decisions Using YES-NO buttons on message box Intro to using Switch Loops For Loops (includes backwards & nested) Using While & Do Loops Getting a users PIN number Foreach Loop and listboxes Foreach loops and container controls
Bitwise Operations	AND Bitwise ops (console app) OR Bitwise ops (console app) XOR Bitwise ops (console app)
Formatting Strings	How to format numbers How to format data as currency How to create multi-line text in a label Working with escape sequences
Custom Methods	How to create custom methods (functions)
String Functions	How to use the TRIM function Using Substring instead of Left, Mid, Right
Variables	How to use module-level variables Using Totals & Counts with module-level variables Using variables to add contents of textboxes
Collections (For Each loops, Lists<>)	foreach Loop using a list box foreach loop to find textboxes in the controls collection foreach loop for clearing textbox controls inside a container control Working with Lists<>
File I/O & Networking	StreamReader & StreamWriter Using Streams to read text file Read/Write to text file (includes Try-Catch & foreach loop) The Using Keyword: Working with "using" & StreamReader Working with "using" & StreamWriter Network Programming How to find all Com Ports and load into a combo box Test if Network is up
Classes	Introduction to Classes Part 1 Introduction to Classes Part 2 Call a Form method from another class
ADO Stuff	MS Access Textbox Validation and Databases A Text box Control Validation Class Read MS ACCESS DB using ADO in Code Use ACCESS DB & Grid to modify Records with a separate class for ADO objects SQL Database DataSources and SQL with error handling Read SQL DB using ADO in Code
Extras	Web Browser Working with the Web Browser Control Using the Process Component Progress Bar & Splash Screen Progress Bar controls a splash screen