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

In C#, MaskedTextBox control gives a validation procedure for the user input on the form like date, phone numbers, etc. Or in other words, it is used to provide a mask which differentiates between proper and improper user input. In MaskedTextBox control, you can style the border of the MaskedTextBox 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 Fixed3D. You can set this property in two different ways:

1. Design-Time: It is the easiest way to set the border style of the MaskedTextBox 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 MaskedTextBox control from the toolbox on the form as shown in the below screenshot:

  

• Step 3: After drag and drop you will go to the properties of the MaskedTextBox and set the border style of the MaskedTextBox as shown in the below image:

  

  
  
  

  Output:
  

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

public System.Windows.Forms.BorderStyle BorderStyle { get; set; }

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

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

  // Creating a MaskedTextBox
  MaskedTextBox m = new MaskedTextBox();
  

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

  // Setting the BorderStyle
  m.BorderStyle = BorderStyle.Fixed3D;
  

• Step 3: And last add this MaskedTextBox control to the form using the following statement:

  // Adding MaskedTextBox control on the form
  this.Controls.Add(m);
  

  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 WindowsFormsApp36 {
  
  public partial class Form1 : Form {
  
      public Form1()
      {
          InitializeComponent();
      }
  
      private void Form1_Load(object sender, EventArgs e)
      {
          // Creating and setting the
          // properties of the Label
          Label l1 = new Label();
          l1.Location = new Point(413, 98);
          l1.Size = new Size(176, 20);
          l1.Text = " Example";
          l1.Font = new Font("Bauhaus 93", 12);
  
          // Adding label on the form
          this.Controls.Add(l1);
  
          // Creating and setting the
          // properties of Label
          Label l2 = new Label();
          l2.Location = new Point(242, 135);
          l2.Size = new Size(126, 20);
          l2.Text = "Phone number:";
          l2.Font = new Font("Bauhaus 93", 12);
  
          // Adding label on the form
          this.Controls.Add(l2);
  
          // Creating and setting the
          // properties of the MaskedTextBox
          MaskedTextBox m = new MaskedTextBox();
          m.Location = new Point(374, 137);
          m.Mask = "000000000";
          m.Size = new Size(176, 20);
          m.Name = "MyBox";
          m.BorderStyle = BorderStyle.Fixed3D;
          m.Font = new Font("Bauhaus 93", 18);
  
          // Adding MaskedTextBox
          // control on the form
          this.Controls.Add(m);
      }
  }
  }

  Output: