How to set Read-Only content in 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 are allowed to set the text in the MaskedTextBox for read-only using ReadOnly Property. If the value of this property is true, then the text present in the MaskedTextBox is read-only. Otherwise, false. The default value of this property is false. You can set this property in two different ways:

1. Design-Time: It is the easiest way to set the value of ReadOnly property of MaskedTextBox control 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 image:

  • Step 3: After drag and drop you will go to the properties of the MaskedTextBox and set the value of ReadOnly property of MaskedTextBox control 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 value of ReadOnly property of the MaskedTextBox control programmatically with the help of given syntax:

public bool ReadOnly { get; set; }

The value of this property is of System.Boolean type, either true or false. The following steps show how to set the value of ReadOnly property of the MaskedTextBox control 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 ReadOnly property of the MaskedTextBox provided by the MaskedTextBox class.
    // Setting the ReadOnly property
    m.ReadOnly = true;
    
  • 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:

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    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 WindowsFormsApp39 {
      
    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("Bell MT", 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("Bell MT", 12);
      
            // Adding label on the form
            this.Controls.Add(l2);
      
            // Creating and setting the 
            // properties of 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.Text = "999999999";
            m.ReadOnly = true;
            m.Font = new Font("Bell MT", 18);
      
            // Adding MaskedTextBox 
            // control on the form
            this.Controls.Add(m);
        }
    }
    }

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    Output:



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