Monthly Archives: November 2014

Remove the hyperlinks from a Word document in C#

Posted on November 30, 2014 by RodStephens

This example shows how you can remove the hyperlinks from a Word document. When you select text on a web page and paste it into a Word document, the result often contains hyperlinks that you don’t want. (Actually after you … Continue reading →

Posted in files, Office, Word | Tagged C#, C# programming, example, example program, files, hyperlinks, Office, remove hypelinks, Windows Forms programming, Word, Word document, Word.Application | Leave a comment

Find the tangent lines between a point and a circle in C#

Posted on November 30, 2014 by Rod Stephens

Finding the tangent lines between a point and a circle isn’t too hard if you’re familiar with the example Determine where two circles intersect in C#. Consider the figure on the right. R is the radius of the circle. You … Continue reading →

Posted in algorithms, geometry, graphics, mathematics | Tagged algorithms, C#, C# programming, circle, circle-line tangent, example, example program, geometry, graphics, line, line-circle tangent, mathematics, tangent, Windows Forms programming | 1 Comment

Print a form or control in C#

Posted on November 29, 2014 by RodStephens

This example shows how you can print a form or control in a C# program. Way back in the days of Visual Basic 6, there was a PrintForm method. It simply grabbed an image of the form and printed it. … Continue reading →

Posted in controls, forms, printing | Tagged C#, C# programming, controls, example, example program, forms, print control, print control image, print form, print form image, PrintForm, printing, Windows Forms programming | Leave a comment

Force garbage collection in C#

Posted on November 29, 2014 by RodStephens

This example shows how you can force garbage collection in C#. The .NET languages use a garbage collection scheme of memory management. There are a few weird details, but the basic process is this. When the application is running low … Continue reading →

Posted in memory, system | Tagged C#, C# programming, Collect, example, example program, finalization, Finalize, force garbage collection, garbage collection, GC, memory, non-determinstic finalization, system, Windows Forms programming | Leave a comment

Handle DataGridView errors in C#

Posted on November 28, 2014 by Rod Stephens

This example shows how you can handle DataGridView errors when you modify the data in the DataGridView control. The example Build a DataTable and bind it to a DataGridView in C# shows how to use a DataGridView control to display … Continue reading →

Posted in controls, database | Tagged C#, C# programming, catch errors, controls, database, DataError, DataGridView, DataTable, error handling, errors, example, example program, exception handling, handle errors, Windows Forms programming | 1 Comment

Build a DataTable and bind it to a DataGridView in C#

Posted on November 28, 2014 by Rod Stephens

This example shows how you can build a DataTable and bind it to a DataGridView control. A DataTable is an in-memory representation of a relational database table. It can define columns of particular data types and even enforce uniqueness and … Continue reading →

Posted in controls, database | Tagged binding, C#, C# programming, controls, data binding, database, DataGridView, DataTable, example, example program, in-memory DataTable, Windows Forms programming | 15 Comments

Bind a DataGrid to a DataSet holding multiple tables at runtime in C#

Posted on November 28, 2014 by Rod Stephens

This example shows how you can bind a DataGrid control to a DataSet loaded from an MDB file at runtime. When the form loads, the following code builds the DataSet and binds it to the form’s DataGrid control. // The … Continue reading →

Posted in controls, database | Tagged C#, C# programming, controls, database, DataGrid, DataSet, example, example program, OLE DB, OleDbCommandBuilder, Windows Forms programming | 11 Comments

List OLE DB providers installed on the system in C#

Posted on November 27, 2014 by RodStephens

This example shows how you can list OLE DB providers installed on the system. (I recently had to run an older program on a new system, and the provider used by the old program wasn’t installed. This example let me … Continue reading →

Posted in database, system | Tagged C#, C# programming, database, database providers, example, example program, List OLE DB providers, OLE DB providers, OleDbEnumerator, system, Windows Forms programming | 1 Comment

Draw a labeled line graph that displays value tooltips in C#

Posted on November 27, 2014 by Rod Stephens

This (fairly complicated) example maps between several different coordinate systems: The main graph is mapped from a coordinate space where 1900 ≤ x ≤ 2010 and 0 ≤ y ≤ 8000 to an area on the screen. Each data point … Continue reading →

Posted in drawing, graphics, mathematics, transformations | Tagged C#, C# programming, drawing, example, example program, graph, graphics, line graph, mathematics, rotated text, strings, tooltips, transformations, Windows Forms programming | 1 Comment

Map points between coordinate systems in C#

Posted on November 27, 2014 by Rod Stephens

This example shows how you can easily map points between different coordinate systems. The Graphics object provides transformations that let you scale, translate, rotate, skew, and otherwise transform graphics as you draw them. One important use of these transformations is … Continue reading →