http://www.thescarms.com/dotnet Loaded with VB.NET and C# solutions to all your .NET questions! http://www.thescarms.com/images/TheScarms320_54.gif http://www.thescarms.com/dotnet Copyright 2007 David Scarmozzino. All Rights Reserved. en-us How to Programmatically add new columns to a .NET DataTable http://www.thescarms.com/dotnet/AddColumns.aspx Get the path to your VB or C# .NET application. http://www.thescarms.com/dotnet/AppPath.aspx Get your .NET application's assembly information. http://www.thescarms.com/dotnet/AppProperties.aspx Retrieve your .NET Application's configuration data (appSettings) using C# or VB. http://www.thescarms.com/dotnet/AppSettings.aspx How do I save a DataSet to Excel in ASP.NET. http://www.thescarms.com/dotnet/AspExport.aspx Change the cursor to a Wait cursor in ASP.NET. http://www.thescarms.com/dotnet/AspWaitCursor.aspx Learn about .NET Private and Shared Assemblies, Modules, Global Assembly Cache (GAC), GacUtil.exe, Side by Side Versioning, Manifests and Deployment. http://www.thescarms.com/dotnet/Assembly.aspx Bind an ADO.NET DataSet or DataTable to a Combobox in VB.NET using the ComboBox's DisplayMember and ValueMember properties to display one value but use a different value. http://www.thescarms.com/dotnet/BindCombobox.aspx How to add items to, remove items from and enumerate through .NET collections, hashtables and arraylists which all derive from the System.Collections namespace. http://www.thescarms.com/dotnet/Collections.aspx Prevent users from resizing columns in the .NET WinForms DataGrid by deriving a new DataGrid and overridding its OnMouseDown method. http://www.thescarms.com/dotnet/ColumnResize.aspx Format columns in the .NET Winforms Datagrid using a DataGridTableStyle and GridColumnStyles for each DataColumn bound to your DataTable http://www.thescarms.com/dotnet/ColumnStyles.aspx Add DataRows to a Combobox in VB.NET without using data binding to overcome a bug in V1.1 of the .NET Framework. http://www.thescarms.com/dotnet/Combobox.aspx Display a Delete Confirmation dialog when the DEL key is pressed in a .NET WinForms DataGrid by subclassing the DataGrid and overriding its ProcessDialogKey method. http://www.thescarms.com/dotnet/ConfirmDelete.aspx Issue a modal JavaScript dialog to the user from an ASP.NET web page using the web page's RegisterStartupScript method and the session object http://www.thescarms.com/dotnet/confirmdialog.aspx Read and write cookies and set cookie properties in ASP.NET web pages using the Request.Cookies and Response.Cookies CookieCollections. http://www.thescarms.com/dotnet/cookies.aspx Programmatically pass parameter values into a Crystal report at run time from VB.NET using the Crystal ReportDocument and ParameterValues objects. http://www.thescarms.com/dotnet/CrystalParms.aspx Programmatically load and run a Crystal report from VB.NET and view it using the Crystal Report Viewer control. http://www.thescarms.com/dotnet/CrystalRptViewer.aspx Change the color of individual ListBox items with C# and .NET by writing your own handler for the ListBox's DrawItem event http://www.thescarms.com/dotnet/CustomListBox.aspx Conditionally set properties of ASP.NET control on .ASPX web pages at run time using Template Columns and the Databinder class of the System.Web.UI namespace. http://www.thescarms.com/dotnet/Databinder.aspx Add a databound ComboBox to the .NET WinForms DataGrid using VB.NET or C# by deriving a new datagrid column style from the DataGridTextBoxColumn class http://www.thescarms.com/dotnet/DataGridCombo.aspx Determine if your ADO.NET's DataSet's contents have changed by examining the RowState for each DataRow returned by the DataTable's GetChanges method. http://www.thescarms.com/dotnet/DataSetChanged.aspx Get a DataSet's current row after its bound DataGrid was sorted using the Current property of the DataGrid's BindingContext or via the CurrencyManager http://www.thescarms.com/dotnet/DataSetRowNum.aspx Debug .NET code at runtime with Trace output and the EventLogListener and the TextWriterListener provided by the System.Diagnostics namespace. http://www.thescarms.com/dotnet/DebugTrace.aspx heScarms Visual Basic.NET, C#, ADO.NET, and ASP.NET Code Library http://www.thescarms.com/dotnet/Default.aspx VB.NET snippet showing how to set default values for new DataRows being added to an ADO.NET DataTable http://www.thescarms.com/dotnet/DefaultValues.aspx Derive or subclass an existing Winforms Datagrid or any other control in .NET to create a new custom control http://www.thescarms.com/dotnet/DeriveGrid.aspx Disable the TAB, Arrow, Home, End, Page Up and Page Down keys in the .NET WinForms DataGrid by deriving a new DataGrid and overriding its ProcessCmdKey mewthod http://www.thescarms.com/dotnet/DisableKeys.aspx Make a DataGrid row read only when it is clicked based on a cell's value. Also, see how to work with delegates, events, and event arguments. http://www.thescarms.com/dotnet/DisableRow.aspx Prevent Deletes when the DELete key is pressed in a WinForms DataGrid by subclassing the DatasGrid and overriding its ProcessDialogKey and PreProcessMessage methods. http://www.thescarms.com/dotnet/DisallowDeletes.aspx Create a Crystal Report using a .NET DLL as the report's datasource. The DLL exposes methods which return DataTables that are consumed by the report. http://www.thescarms.com/dotnet/DLLDatasource.aspx TheScarms.com ADO.NET DataSet/DataTable Related Code Samples http://www.thescarms.com/dotnet/dotnetado.aspx TheScarms.com ASP.NET and Web Application Samples http://www.thescarms.com/dotnet/dotnetasp.aspx How to use Crystal Reports with .NET applications http://www.thescarms.com/dotnet/dotnetcrystal.aspx How to debug code and handle errors in .NET applications http://www.thescarms.com/dotnet/dotnetdebug.aspx Learn how to send E-mail with attachments from VB.NET applications http://www.thescarms.com/dotnet/dotnetemail.aspx Learn about the GAC, Assemblies, Retrieving Environmental Related Information http://www.thescarms.com/dotnet/dotnetenv.aspx Sample programs and solutions covering everyday programming issues http://www.thescarms.com/dotnet/dotnetgen.aspx Working with the .NET WinForms DataGrid Control http://www.thescarms.com/dotnet/dotnetgrid.aspx .NET I/O related examples on how to work with the file system http://www.thescarms.com/dotnet/dotnetio.aspx Work with Microsoft EXCEL from .NET via the Excel Interop http://www.thescarms.com/dotnet/dotnetmsobj.aspx .NET Security Related Examples http://www.thescarms.com/dotnet/dotnetsecurity.aspx Working with String and Regular Expressions http://www.thescarms.com/dotnet/dotnetstring.aspx Examples of working with and extending WinForms and Winform Controls http://www.thescarms.com/dotnet/dotnetwinform.aspx Locate duplicate DataGrid rows before saving the DataGrid's data by looping through the data and filtering the underlying datatable. http://www.thescarms.com/dotnet/DuplicateRows.aspx Dynamically read in, compile, and execute VB.NET source code by programmatically invoking the .NET compiler, loading the compiled assembly, and executing it. http://www.thescarms.com/dotnet/DynamicCode.aspx Edit a .NET 2003 solution with an earlier version of .NET. by modifying the .SLN solution file. http://www.thescarms.com/dotnet/EarlierVersion.aspx Send rich format email with attachments in VB.NET using the System.Web.Mail namespace and the Smtp mail protocol. http://www.thescarms.com/dotnet/Email.aspx Programmatically end the editing of a cell in the .NET Winforms DataGrid so the cell is flagged as changed when it looses focus. http://www.thescarms.com/dotnet/EndEdit.aspx Programmatically Enumerate or loop through the values of an ENUMeration structure in VB.NET. http://www.thescarms.com/dotnet/Enumeration.aspx Associate and disassociate a block of code (handler) with an event dynamically at run time in VB.NET using the AddHandler and RemoveHandler methods. http://www.thescarms.com/dotnet/EventHandler.aspx Create, read, write and delete Windows event logs in VB.NET with the EventLog class from the Imports System.Diagnostics namespace. http://www.thescarms.com/dotnet/EventLog.aspx Populate an Excel Worksheet from a .NET application using the Excel object via COM and the Interop layer provided by the .NET Framework. http://www.thescarms.com/dotnet/ExcelObject.aspx Detect when a file or the contents of a folder change with .NET's FileSystemWatcher. Watch for specific events and associate handlers with these events. http://www.thescarms.com/dotnet/FileSysWatcher.aspx Format how data displays in a bound DataGrid on an ASP.NET web page using the DataFormatString command. http://www.thescarms.com/dotnet/FormatData.aspx Add/remove a shared assembly to/from the .NET Global Assembly Cache (GAC) using GacUtil.exe which ships with .NET http://www.thescarms.com/dotnet/GacUtil.aspx Hide columns in the .NET Winforms Datagrid using a DataGridTableStyle and a GridColumnStyle. http://www.thescarms.com/dotnet/HideColumn.aspx Get the DataGrid row or column that the user clicked using the DataGrid's HitTest method to obtain a HitTestInfo object. http://www.thescarms.com/dotnet/HitTest.aspx Upload files from a client PC to the web server with ASP.NET using the HtmlInputFile server control http://www.thescarms.com/dotnet/HtmlInputFile.aspx Use the HTTP Cache to improve performance when loading ASP.NET web pages since the page will be retrieved from the server's memory instead of from disk. http://www.thescarms.com/dotnet/HTTPCache.aspx Impersonate another user programmatically in ASP.NET using the LogonUser API call so you code runs under the authority of a different user Id. http://www.thescarms.com/dotnet/impersonate.aspx Create an Irregular, non-rectangular shaped form, based on any bitmap image, using VB.NET and Windows regions. http://www.thescarms.com/dotnet/IrregularForm.aspx Get the currently logged in user and see if they belong to a specific security group using principals and the System.Threading namespace. http://www.thescarms.com/dotnet/IsInRole.aspx Determine if a string value is numeric in C# similar to VB's IsNumeric function. http://www.thescarms.com/dotnet/IsNumeric.aspx Create compressed ZIP files from .NET applications using the java.util.zip method in the MS Java Runtime http://www.thescarms.com/dotnet/JavaZip.aspx See how to Late Bind to a COM Components with VB.NET at runtime instead of using early binding at compile time. http://www.thescarms.com/dotnet/LateBind.aspx To limit key input to WinForms DataGrid cells, use a GridColumnStyle to define a DataGridTextBoxColumn for the column then associate a handler for the DataGridTextBoxColumn's KeyPress event. http://www.thescarms.com/dotnet/LimitKeys.aspx List all files in a folder and get their attributes in VB.NET using the DirectoryInfo, GetFiles, and FileInfo constructs from the System.IO namespace. http://www.thescarms.com/dotnet/ListFiles.aspx Localize ASP.NET web pages with resource files so the page displays its text in the language used by its viewer. http://www.thescarms.com/dotnet/Localize.aspx Send E-mail, using the client PC's default e-mail application, from an ASP.NET web page with the MailTo command http://www.thescarms.com/dotnet/MailTo.aspx Measure the height and width of a string in VB.NET using Graphics.MeasureString to calculate how many characters can fit in a StringFormat object which encapsulates font and line spacing information. http://www.thescarms.com/dotnet/MeasureString.aspx Change a label's forecolor and font on mouse overs in VB.NET or C# by assigning it a different font object http://www.thescarms.com/dotnet/MouseOver.aspx Programmatically move columns in the .NET DataGrid through the use of a TableStyle and GridColumnStyles. http://www.thescarms.com/dotnet/MoveColumns.aspx Move a .NET Windows Form that has no title bar by adding code the the form's MouseDown, MouseUp, and, MouseMove events. http://www.thescarms.com/dotnet/MoveForm.aspx .NET NameValueCollections are similar to Hash Tables - they store items in key/value pairs and let you retrieve items by specifying the Key or the index. http://www.thescarms.com/dotnet/NameValueCollection.aspx Make the Winforms DataGrid have no current cell by deriving a new DataGrid and using the SendMessage API. http://www.thescarms.com/dotnet/NoCurrentCell.aspx C# code to compress NTFS formatted files using the DeviceIoControl API. http://www.thescarms.com/dotnet/NTFSCompress.aspx Use the .NET PageSetupDialog object to display Window's Page Setup Dialog from VB.NET and work with the PrintDocument object. http://www.thescarms.com/dotnet/PageSetup.aspx Print a DataSet's Contents from VB.NET using the PrintDocument object accounting for text and font size, paper size, DataRow status, line wrapping, etc. http://www.thescarms.com/dotnet/PrintDataSet.aspx Launch and monitor external programs from .NET applications using the Process class in the System.Diagnostics namespace and control external process I/O. http://www.thescarms.com/dotnet/Process.aspx C# code to add a ProgressBar to a derived .NET StatusBar control http://www.thescarms.com/dotnet/ProgressStatus.aspx C# code to read text files in .NET using the System.IO namespace StreamReader object http://www.thescarms.com/dotnet/ReadFile.aspx Use Regular Expressions and the regex object to parse a string to find all unique or duplicate words http://www.thescarms.com/dotnet/RegExUnique.aspx Validate dates and other data in .NET using Regular Expressions match predefined patterns http://www.thescarms.com/dotnet/RegularExp.aspx Retrieve schema information from an Excel worksheet with ADO.NET using the GetOleDbSchemaTable method of the OleDBConnection connection object http://www.thescarms.com/dotnet/Schema.aspx Programmatically scroll the DataGrid to a particular row using the DataGrid's protected GridVScrolled method http://www.thescarms.com/dotnet/ScrollDataGrid.aspx Serialize and de-serialize .NET object such as DataSets, classes, etc, so they can be stored in a file or stream or viewstate in ASP.NET. http://www.thescarms.com/dotnet/serializeable.aspx Determine if ASP.NET's Session Object has timed out by examining its IsNewSession property and the ASP session Id cookie. http://www.thescarms.com/dotnet/Session.aspx Use JavaScript from your server code to set focus to a specific control on an ASP.NET web page http://www.thescarms.com/dotnet/setfocus.aspx Send Email from VB.NET using the equivalent of the ShellExecute API http://www.thescarms.com/dotnet/ShellExecute.aspx Browse for folders using Shell32.dll's BrowseForFolder method in C# http://www.thescarms.com/dotnet/ShlFolder.aspx Make the .NET WinForms DataGrid support single select versus the default multiselect mode through subclassing and overriding its OnMouseMove and OnMouseDown methods. http://www.thescarms.com/dotnet/SingleSelect.aspx Get Paths to Windows Special Folders, such as My Documents, Desktop, Favorites, etc. from .NET by declaring a variable of type System.Environment.SpecialFolder http://www.thescarms.com/dotnet/SpecialFolders.aspx Simplify debugging by getting the name of the currently executing .NET method at runtime using the StackFrame, StackTrace, and MethodBase classes in the System.Diagnostics and System.Reflection namespaces. http://www.thescarms.com/dotnet/StackFrame.aspx Convert Strings to Byte Arrays and Back in .NET using ASCIIEncoding and the GetBytes and GetString methods http://www.thescarms.com/dotnet/StringToByte.aspx Add multi-threading to .NET applications to improve user interface responsiveness. Start, pause, and cancel worker threads. http://www.thescarms.com/dotnet/Threading.aspx Sum a column in the .NET Winforms DataGrid to produce a total by looping through the DataGrid and examining its DataGridTextBoxColumn's values. http://www.thescarms.com/dotnet/TotalRow.aspx Catch and handle all unhandled exceptions in your VB.NET program without using Try-Catch blocks by using the Application Domain object. http://www.thescarms.com/dotnet/unhandled.aspx Programmatically loop through ASP.NET Datagrid rows to retrieve either bound or template column values. http://www.thescarms.com/dotnet/WebDataGrid.aspx VB.NET sample showing how to create, install, and communicate with an unattended Windows Service using .NET http://www.thescarms.com/dotnet/WinService.aspx Get your PC's Network Interface Card's MAC Address or Hard Drive Serial Number from VB.NET using Windows Management Instrumentation (WMI). http://www.thescarms.com/dotnet/WMI.aspx Populate Treeview control from an XML file using C# to recursively read the DOM and add nodes to the treeview control. http://www.thescarms.com/dotnet/XMLTreeview.aspx Create a Crystal Report from .NET that's based on an XML schema (XSD) file as the report's datasource http://www.thescarms.com/dotnet/XSDDatasource.aspx Convert comma delimited data to XML using an XSLT (Extensible Stylesheet Language Transformation) from .NET http://www.thescarms.com/dotnet/XSLT.aspx