Tag Archives: TextBox

Resize a TextBox to fit its text in C#

Posted on February 1, 2018 by Rod Stephens

This example shows how you can resize a TextBox to fit its contents as the user types. The key is the following AutoSizeTextBox method. // Make the TextBox fit its contents. private void AutoSizeTextBox(TextBox txt) { const int x_margin = … Continue reading →

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Make a TextBox preview extender provider in C#

Posted on August 22, 2017 by Rod Stephens

This example shows how to convert the TextBox preview techniques described in the last few posts into an extender provider. The previous examples showed the basic technique, but they were hard-wired to specific TextBox controls so they weren’t very flexible. … Continue reading →

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Make the user enter a float in C#

Posted on August 21, 2017 by Rod Stephens

The posts Preview TextBox changes in C# and Preview TextBox changes in C#, Part 2 show how you can make a TextBox accept only integers. This example is similar except it makes a TextBox only accept floats. This change is … Continue reading →

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Preview TextBox changes in C#, Part 2

Posted on August 19, 2017 by Rod Stephens

Part 1 of this post explained how the example previews changes made by keyboard events. It then accepts or cancels the changes depending on whether the TextBox control’s new value is a valid integer (or the start of one as … Continue reading →

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Preview TextBox changes in C#

Posted on August 17, 2017 by Rod Stephens

One of the more annoying omissions from the Windows Forms controls is a way to preview changes to a TextBox before they occur. For example, suppose you want the user to enter a floating point value in a TextBox. The … Continue reading →

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Make Ctrl+A select all of the text in a TextBox in C#

Posted on July 8, 2017 by Rod Stephens

Often it’s convenient for the user to be able to press Ctrl+A to select all of the text in the TextBox that has the focus. Strangely that’s not the default behavior for the TextBox. Perhaps the TextBox doesn’t handle Ctrl+A … Continue reading →

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Make a TextBox with auto-complete in C#

Posted on May 18, 2017 by RodStephens

It’s not too hard to make a TextBox provide an auto-complete feature. In fact, the TextBox control offers three auto-complete styles. This example demonstrates those styles. To provide auto-complete, you need to set the following three TextBox properties. AutoCompleteMode – … Continue reading →

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Remove a TextBox control’s context menu in C#

Posted on March 7, 2017 by Rod Stephens

Normally a TextBox control has a context menu that appears when you right-click it, but what if you don’t want that context menu? I mean, really. Am I required to have “Show Unicode control characters” and “Open IME” on every … Continue reading →

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Make a TextBox convert text into proper case in C#

Posted on January 2, 2017 by Rod Stephens

The example Convert a string to proper case (title case) in C# uses a CultureInfo object’s TextInfo property to convert text into proper case (or title case). There are a couple of tricks and potential problems that you need to … Continue reading →

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Set tab positions inside a ListBox or TextBox in C#

Posted on July 17, 2014 by Rod Stephens

This example demonstrates three methods for aligning values in columns, two of which set tab positions in a ListBox or TextBox. To set tabs in a ListBox, you need to set the control’s UseCustomTabOffsets property to true. Then get the … Continue reading →

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