How to set Default Password Character in TextBox in C#?

In Windows forms, TextBox plays an important role. With the help of TextBox, the user can enter data in the application, it can be of a single line or of multiple lines. In TextBox, you are allowed to set a value which represents whether the text in the TextBox control should appear as the default password character by using the UseSystemPasswordChar property of the TextBox. If you set the value of this property to true, then the text present in the TextBox control should appear as the default password character, otherwise set false. In Windows form, you can set this property in two different ways:

1. Design-Time: It is the simplest way to set the UseSystemPasswordChar property of the TextBox as shown in below steps:

  • Step 1: Create a windows form.
    Visual Studio -> File -> New -> Project -> WindowsFormApp
  • Step 2: Drag the TextBox control from the ToolBox and Drop it on the windows form. You can place TextBox anywhere on the windows form according to your need. As shown in the below image:
  • Step 3: After drag and drop you will go to the properties of the TextBox control to set the UseSystemPasswordChar property of the TextBox. 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 UseSystemPasswordChar property of the TextBox programmatically with the help of the given syntax:

public bool UseSystemPasswordChar { get; set; }

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

  • Step 1 : Create a textbox using the TextBox() constructor provided by the TextBox class.
    // Creating textbox
    TextBox Mytextbox = new TextBox();
    
  • Step 2 : After creating TextBox, set the UseSystemPasswordChar property of the TextBox provided by the TextBox class.
    // Set UseSystemPasswordChar property
    Mytextbox.UseSystemPasswordChar = true;
    
  • Step 3 : And last add this textbox control to from using Add() method.
    // Add this textbox to form
    this.Controls.Add(Mytextbox);
    

    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 my {
      
    public partial class Form1 : Form {
      
        public Form1()
        {
            InitializeComponent();
        }
      
        private void Form1_Load(object sender, EventArgs e)
        {
      
            // Creating and setting the properties of Lable1
            Label Mylablel = new Label();
            Mylablel.Location = new Point(96, 54);
            Mylablel.Text = "Enter Password";
            Mylablel.AutoSize = true;
            Mylablel.BackColor = Color.LightGray;
      
            // Add this label to form
            this.Controls.Add(Mylablel);
      
            // Creating and setting the properties of TextBox1
            TextBox Mytextbox = new TextBox();
            Mytextbox.Location = new Point(187, 51);
            Mytextbox.BackColor = Color.LightGray;
            Mytextbox.ForeColor = Color.DarkOliveGreen;
            Mytextbox.AutoSize = true;
            Mytextbox.Name = "text_box1";
            Mytextbox.UseSystemPasswordChar = true;
      
            // Add this textbox to form
            this.Controls.Add(Mytextbox);
        }
    }
    }

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    Output:



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