How to set the Visibility of the ComboBox in C#?

Last Updated : 27 Jun, 2019

In Windows forms, ComboBox provides two different features in a single control, it means ComboBox works as both TextBox and ListBox. In ComboBox, only one item is displayed at a time and the rest of the items are present in the drop-down menu. You are allowed to set the visibility of the ComboBox by using Visible Property.
If you want to display the given ComboBox and its child controls, then set the value of Visible property to true, otherwise set false. The default value of this property is true. You can set this property using two different methods:

1. Design-Time: It is the easiest method to set the visibility of the ComboBox control using the following steps:

Step 1: Create a windows form as shown in the below image:
Visual Studio -> File -> New -> Project -> WindowsFormApp
Step 2: Drag the ComboBox control from the ToolBox and dropit on the windows form. You are allowed to place a ComboBox control anywhere on the windows form according to your need.
Step 3: After drag and drop you will go to the properties of the ComboBox control to set the visibility the ComboBox.

Output:

2. Run-Time: It is a little bit trickier than the above method. In this method, you can set the visibility of the ComboBox programmatically with the help of given syntax:

public bool Visible { get; set; }

Here, the value of this property is of System.Boolean type. Following steps are used to set the visibility of the ComboBox:

Step 1: Create a combobox using the ComboBox() constructor is provided by the ComboBox class.
```
// Creating ComboBox using ComboBox class
ComboBox mybox = new ComboBox();
```
Step 2: After creating ComboBox, set the visibility of the ComboBox.
```
// Set the visibility of the combobox 
mybox.Visible = false;
```

Step 3: And last add this combobox control to form using Add() method.

// Add this ComboBox to form
this.Controls.Add(mybox);

Example:

using System; 
using System.Collections.Generic; 
using System.ComponentModel; 
using System.Data; 
using System.Drawing; 
using System.Linq; 
using System.Text; 
using System.Threading.Tasks; 
using System.Windows.Forms; 
  
namespace WindowsFormsApp11 { 
  
public partial class Form1 : Form { 
  
    public Form1() 
    { 
        InitializeComponent(); 
    } 
  
    private void Form1_Load(object sender, EventArgs e) 
    { 
        // Creating and setting the properties of label 
        Label l = new Label(); 
        l.Location = new Point(222, 80); 
        l.Size = new Size(99, 18); 
        l.Text = "Select city name"; 
  
        // Adding this label to the form 
        this.Controls.Add(l); 
  
        // Creating and setting the properties of comboBox 
        ComboBox mybox = new ComboBox(); 
        mybox.Location = new Point(327, 77); 
        mybox.Size = new Size(216, 26); 
        mybox.Visible = false; 
        mybox.Name = "My_Cobo_Box"; 
        mybox.Items.Add("Mumbai"); 
        mybox.Items.Add("Delhi"); 
        mybox.Items.Add("Jaipur"); 
        mybox.Items.Add("Kolkata"); 
        mybox.Items.Add("Bengaluru"); 
  
        // Adding this ComboBox to the form 
        this.Controls.Add(mybox); 
    } 
} 
} 