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C# CheckBox: Windows Forms
Use the CheckBox control from Windows Forms. Understand the CheckState property.CheckBox has 2 or 3 states. This control provides a way for an option to be selected and deselected independently of other options. As with other controls, it can be manipulated in C# code for custom behaviors.
To get started, you must first add a CheckBox control to your Windows Form in the designer view in Visual Studio. Open the Toolbox pane and then find and double-click on the CheckBox icon. This will insert a CheckBox into your window.
Next: You can add event handlers and change properties by right-clicking on the CheckBox and selecting Properties.
CheckState. It is possible to set the CheckBox to allow three states. These include an indeterminate state as well as checked and unchecked. The next screenshot shows what the indeterminate state looks like when it has been selected in the form.
C# program that uses CheckState and Checked properties
using System;
using System.Windows.Forms;
namespace WindowsFormsApplication4
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
// Acquire the state of the CheckBox.
CheckState state = checkBox1.CheckState;
// Demonstrate how the CheckBox can be switched upon.
switch (state)
{
case CheckState.Checked:
case CheckState.Indeterminate:
case CheckState.Unchecked:
{
MessageBox.Show(state.ToString());
break;
}
}
// Tell if the box is checked.
MessageBox.Show(checkBox1.Checked.ToString());
}
}
}
CheckAlign. One of the best things about Windows Forms is that it allows you to change a lot of the styles to suit your tastes. Please remember that if you are a computer programmer your tastes might not match those of a professional designer.
Next: In this screenshot, we see what the CheckBox looks like when I changed the CheckAlign property, and also the FlatStyle property.
PropertyCheckChanged. Typically, the CheckBox control is not used as a key control that determines what happens on the Form. The CheckBox state is read when a user performs an action on another control, such as a button.
However, the most useful event is probably CheckChanged. It fires when the user clicks or changes the CheckBox. You can add the CheckChanged event handler by clicking on the lightning bolt and double-clicking on the CheckChanged name.Event
Summary. The CheckBox is useful control in the Windows Forms platform and the C# language. But it is not often a major focus of applications. It is instead a small, supporting control used with other controls.
Review: We described various properties of the CheckBox, which may be useful for planning some programming tasks.
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- C# StackOverflowException
- C# StartsWith and EndsWith String Methods
- C# Static Array
- C# Static Dictionary
- C# Stopwatch Examples
- C# Stream
- C# StreamReader ReadToEnd Example (Read Entire File)
- C# StreamReader ReadToEndAsync Example (Performance)
- C# StreamReader Examples
- C# StreamWriter Examples
- C# String Append (Add Strings)
- C# String Compare and CompareTo Methods
- C# String Constructor (new string)
- C# string.Copy Method
- C# CopyTo String Method: Put Chars in Array
- C# Empty String Examples
- C# String Equals Examples
- C# String For Loop, Count Spaces in String
- C# string.Intern and IsInterned
- C# String IsUpper, IsLower
- C# String Length Property: Get Character Count
- C# String Literal: Newline and Quote Examples
- C# StringBuilder Capacity
- C# StringBuilder Clear (Set Length to Zero)
- C# StringBuilder Data Types
- C# StringBuilder Performance
- C# StringBuilder Equals (If Chars Are Equal)
- C# StringBuilder Memory
- C# StringBuilder ToString: Get String From StringBuilder
- C# StringWriter Class
- C# Sum Method: Add up All Numbers
- C# Switch Char, Test Chars With Cases
- C# Switch Enum
- C# System (using System namespace)
- C# Tag Property: Windows Forms
- C# TextInfo Examples
- C# TextReader, Returned by File.OpenText
- C# TextWriter, Returned by File.CreateText
- C# this Keyword
- C# ThreadPool
- C# Thread Join Method (Join Array of Threads)
- C# ThreadPool.SetMinThreads Method
- C# TimeZone Examples
- C# Get Title From HTML With Regex
- C# ToArray Extension Method
- C# ToCharArray: Convert String to Array
- C# ToDictionary Method
- C# Token
- C# ToList Extension Method
- C# ToLookup Method (Get ILookup)
- C# ToLower and ToUpper: Uppercase and Lowercase Strings
- ToolStripContainer Control: Dock, Properties
- C# ToolTip: Windows Forms
- C# ToString Integer Optimization
- C# ToString: Get String From Object
- C# ToTitleCase Method
- C# TrackBar: Windows Forms
- C# Tree and Nodes Example: Directed Acyclic Word Graph
- C# TreeView Tutorial
- C# Trim Strings
- C# Thread Methods
- C# History
- C# Features
- C# Variables
- C# Data Types
- C# Operators
- C# Keywords
- C# New Features | C# Version Features
- C# Programs
- C# Program to swap numbers without third variable
- C# Program to convert Decimal to Binary
- C# Program to Convert Number in Characters
- C# Program to Print Alphabet Triangle
- C# Program to print Number Triangle
- C# Program to generate Fibonacci Triangle
- C# String Compare() method
- C# String CompareOrdinal() method
- C# String CompareTo() method
- C# String Concat() method
- C# String Contains() method
- C# String CopyTo() method
- C# String EndsWith() method
- C# String Equals() method
- C# String Format() method
- C# String IndexOf() method
- C# String Insert() method
- C# String Intern(String str) method
- C# String IsInterned() method
- C# String Normalize() method
- C# String IsNullOrEmpty() method
- C# String IsNullOrWhiteSpace() method
- C# String Join() method
- C# String LastIndexOf() method
- C# String LastIndexOfAny() method
- C# String PadLeft() method
- C# String PadRight() method
- C# Nullable
- C# String Remove() method
- C# String Replace() method
- C# String Split() method
- C# String StartsWith() method
- C# String SubString() method
- C# Partial Types
- C# Iterators
- C# Delegate Covariance
- C# Delegate Inference
- C# Anonymous Types
- C# Extension Methods
- C# Query Expression
- C# Partial Method
- C# Implicitly Typed Local Variable
- C# Object and Collection Initializer
- C# Auto Implemented Properties
- C# Dynamic Binding
- C# Named and Optional Arguments
- C# Asynchronous Methods
- C# Caller Info Attributes
- C# Using Static Directive
- C# Exception Filters
- C# Await in Catch Finally Blocks
- C# Default Values for Getter Only Properties
- C# Expression Bodied Members
- C# Null Propagator
- C# String Interpolation
- C# nameof operator
- C# Dictionary Initializer
- C# Pattern Matching
- C# Tuples
- C# Deconstruction
- C# Local Functions
- C# Binary Literals
- C# Ref Returns and Locals
- C# Expression Bodied Constructors and Finalizers
- C# Expression Bodied Getters and Setters
- C# Async Main
- C# Default Expression