How to style the Border of the FlowLayoutPanel in C#?

In Windows Forms, FlowLayoutPanel control is used to arrange its child controls in a horizontal or vertical flow direction. Or in other words, FlowLayoutPanel is a container which is used to organize different or same types of controls in it either horizontally or vertically. In FlowLayoutPanel control, you can set or style the border of the control in the form using BorderStyle Property. This property has three different values that are defined under BorderStyle enum and the values are:

• None value for no border.
• Fixed3D value for 3-D border.
• FixedSingle value for single line border.

The default value of this property is None. You can set this property in two different ways:

1. Design-Time: It is the easiest way to style the border of the FlowLayoutPanel as shown in the following steps:

• Step 1: Create a windows form as shown in the below image:
  Visual Studio -> File -> New -> Project -> WindowsFormApp
  
• Step 2: Next, drag and drop the FlowLayoutPanel control from the toolbox to the form as shown in the below image:

  

• Step 3: After drag and drop you will go to the properties of the FlowLayoutPanel and style the border of the FlowLayoutPanel.

  

  
  
  

  Output:
  

2. Run-Time: It is a little bit trickier than the above method. In this method, you can style the border of the FlowLayoutPanel control programmatically with the help of given syntax:

public string Name { get; set; }

Here, BorderStyle represents the border style of the FlowLayoutPanel control. It will throw an InvalidEnumArgumentException if the value of this property does not belong to BorderStyle enum values. The following steps show how to style the border of the FlowLayoutPanel dynamically:

• Step 1: Create a FlowLayoutPanel using the FlowLayoutPanel() constructor is provided by the FlowLayoutPanel class.

  // Creating a FlowLayoutPanel
  FlowLayoutPanel f = new FlowLayoutPanel();
  

• Step 2: After creating FlowLayoutPanel, set the BorderStyle property of the FlowLayoutPanel provided by the FlowLayoutPanel class.

  // Setting the border style
  f.BorderStyle = BorderStyle.Fixed3D;
  

• Step 3: And last add this FlowLayoutPanel control to the form and also adding child controls in the FlowLayoutPanel using the following statements:

  // Adding a FlowLayoutPanel
  // control to the form
  this.Controls.Add(f);
  
  and 
  
  // Adding child controls to
  // the FlowLayoutPanel
  f.Controls.Add(r1);
  

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 WindowsFormsApp50 {

public partial class Form1 : Form {

    public Form1()
    {
        InitializeComponent();
    }

    private void Form1_Load(object sender, EventArgs e)
    {

        // Creating and setting the
        // properties of FlowLayoutPanel
        FlowLayoutPanel f = new FlowLayoutPanel();
        f.Location = new Point(380, 124);
        f.Size = new Size(216, 57);
        f.Name = "Mycontainer";
        f.Font = new Font("Calibri", 12);
        f.FlowDirection = FlowDirection.RightToLeft;
        f.BorderStyle = BorderStyle.Fixed3D;
        f.ForeColor = Color.BlueViolet;
        f.Visible = true;

        // Adding this control to the form
        this.Controls.Add(f);

        // Creating and setting the
        // properties of radio buttons
        RadioButton r1 = new RadioButton();
        r1.Location = new Point(3, 3);
        r1.Size = new Size(95, 20);
        r1.Text = "R1";

        // Adding this control to
        // the FlowLayoutPanel
        f.Controls.Add(r1);

        RadioButton r2 = new RadioButton();
        r2.Location = new Point(94, 3);
        r2.Size = new Size(95, 20);
        r2.Text = "R2";

        // Adding this control to
        // the FlowLayoutPanel
        f.Controls.Add(r2);

        RadioButton r3 = new RadioButton();
        r3.Location = new Point(3, 26);
        r3.Size = new Size(95, 20);
        r3.Text = "R3";

        // Adding this control to
        // the FlowLayoutPanel
        f.Controls.Add(r3);
    }
}
}

Output: