syncfusion-winforms-double-textbox

Q: How do I install syncfusion-winforms-double-textbox?

Run npx skills add https://github.com/syncfusion/winforms-ui-components-skills --skill syncfusion-winforms-double-textbox in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/syncfusion-winforms-double-textbox/ (personal) or .claude/skills/syncfusion-winforms-double-textbox/ (project).

by syncfusionFrontend & Design

Guide to implementing Syncfusion WinForms DoubleTextBox control for accepting double-precision floating-point values with customizable formatting and validation. Use this when working with numeric input controls requiring double data type support, decimal formatting, or value range constraints in Windows Forms applications.

Installs: 77
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Install

Works with every agent the skills CLI supports.

npx skills add https://github.com/syncfusion/winforms-ui-components-skills --skill syncfusion-winforms-double-textbox

01
Install
Run the command in your project. The CLI asks which agents to install for.
02
Describe the task
Ask your agent for something this skill covers. It loads syncfusion-winforms-double-textbox automatically when relevant.
03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.

SKILL.md

The instructions your agent reads when the skill is triggered.

Implementing Syncfusion WinForms DoubleTextBox

When to Use This Skill

Use this skill when you need to:

Accept and display double-precision floating-point values in a Windows Forms application
Implement numeric input with customizable decimal places and group separators
Apply min/max value constraints to numeric input
Handle value change events or keyboard shortcuts for incrementing/decrementing values
Override the control's default keystroke handling for custom behavior
Apply visual styling based on positive, negative, or zero values

Component Overview

The DoubleTextBox is a specialized text box control derived from the Windows Forms Framework that handles double data type values. It provides:

Automatic double value validation and formatting
Customizable number display (decimal digits, separators, patterns)
Min/max value constraints
Event handling for value changes and keyboard input
Keyboard shortcut support for incrementing/decrementing values
Extensibility through method overrides

Documentation Navigation Guide

Getting Started

📄 Read: references/getting-started.md

Assembly deployment and setup
Adding control via designer
Adding control via C# code
Setting maximum and minimum values
Customizing number format

Number and Format Settings

📄 Read: references/number-and-format-settings.md

Number formatting properties overview
Decimal digits and separators
Value range configuration (MaxValue/MinValue)
Banner text support
Hiding trailing zeros

Appearance and Behavior

📄 Read: references/appearance-and-behavior.md

Border style settings
Color settings for value states
Keyboard support configuration
Overflow indicator display
Active when disabled behavior

Event Handling and Customization

📄 Read: references/event-handling-and-customization.md

DoubleValueChanged event handling
Keyboard events for increment/decrement
Overriding control behavior
Custom HandleSubtractKey implementation
Extending control functionality

Quick Start Example

Basic setup in C#:

using Syncfusion.Windows.Forms.Tools;

// Create instance
DoubleTextBox doubleTextBox1 = new DoubleTextBox();
this.Controls.Add(doubleTextBox1);

// Set value constraints
doubleTextBox1.MaxValue = 100;
doubleTextBox1.MinValue = 0;

// Handle value changes
doubleTextBox1.DoubleValueChanged += (s, e) => 
    MessageBox.Show("Value changed");

Key properties:

DoubleValue - Gets or sets the double value
MaxValue - Maximum allowed value
MinValue - Minimum allowed value
NumberDecimalDigits - Number of decimal places to display
NumberDecimalSeparator - Character used as decimal separator
NumberGroupSeparator - Character used as thousands separator

Common Patterns

Pattern 1: Accept Percentage Input (0-100)

doubleTextBox1.MinValue = 0;
doubleTextBox1.MaxValue = 100;
doubleTextBox1.NumberDecimalDigits = 2;
doubleTextBox1.Text = "50";

Pattern 2: Accept Currency Values

doubleTextBox1.NumberDecimalDigits = 2;
doubleTextBox1.NumberGroupSeparator = ",";
doubleTextBox1.NumberDecimalSeparator = ".";
doubleTextBox1.Text = "1234.56";

Pattern 3: Increment/Decrement with Keyboard

doubleTextBox1.KeyDown += (s, e) =>
{
    if (e.KeyCode == Keys.Up)
        doubleTextBox1.DoubleValue++;
    else if (e.KeyCode == Keys.Down)
        doubleTextBox1.DoubleValue--;
};

Pattern 4: Allow Null/Empty Values

doubleTextBox1.AllowNull = true;
doubleTextBox1.NullString = "";
doubleTextBox1.Text = "";

Key Properties

Property	Type	Purpose
`DoubleValue`	double	Gets or sets the double value of the textbox
`MaxValue`	double	Maximum allowed value
`MinValue`	double	Minimum allowed value
`NumberDecimalDigits`	int	Number of decimal places to display
`NumberDecimalSeparator`	string	Decimal separator character
`NumberGroupSeparator`	string	Thousands separator character
`NumberGroupSizes`	int[]	Sizes of number groups
`NumberNegativePattern`	int	Pattern for negative numbers
`HideTrailingZeros`	bool	Hide trailing zeros in display
`AllowNull`	bool	Allow null/empty values
`NullString`	string	String representation of null

Common Use Cases

Financial Applications - Currency input with two decimal places, value constraints
Measurement Input - Scientific data with variable decimal precision
Percentage Fields - Constrained to 0-100 range with validation
Configuration Settings - Numeric parameters for application tuning
Data Entry Forms - Validated numeric fields with formatting
Calculate Totals - Increment/decrement values with keyboard shortcuts

FAQ

What does the syncfusion-winforms-double-textbox skill do?

How do I install syncfusion-winforms-double-textbox?

Run npx skills add https://github.com/syncfusion/winforms-ui-components-skills --skill syncfusion-winforms-double-textbox in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/syncfusion-winforms-double-textbox/ (personal) or .claude/skills/syncfusion-winforms-double-textbox/ (project).

Which AI agents can use syncfusion-winforms-double-textbox?

Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.

Is syncfusion-winforms-double-textbox safe to install?

No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.

Who maintains syncfusion-winforms-double-textbox?

It is published by syncfusion in syncfusion/winforms-ui-components-skills. It has 77 recorded installs.