How Can I Create Placeholder Text in a Standard Textbox Using C#?

Incorporating Placeholders into a Textbox

In a bid to emulate the placeholder text functionality found in HTML5 textboxes, let's investigate how to implement this feature within a standard textbox.

The essence of this placeholder lies in its conditional display: appearing when the textbox is empty and vanishing upon user interaction. To accomplish this, we can leverage event handlers to monitor the textbox's focus state.

Upon gaining focus, the placeholder text should disappear, allowing the user to enter their own content. A simple TextBox.GotFocus event handler can be employed to clear the placeholder text.

Conversely, when the textbox loses focus and remains empty, the placeholder text should reappear. This can be achieved through a TextBox.LostFocus event handler, which checks if the textbox's text is empty and, if so, replaces it with the placeholder.

Here's a code snippet in C# that demonstrates this concept:

Textbox myTxtbx = new Textbox();
myTxtbx.Text = "Enter text here...";

myTxtbx.GotFocus += GotFocus.EventHandle(RemoveText);
myTxtbx.LostFocus += LostFocus.EventHandle(AddText);

public void RemoveText(object sender, EventArgs e)
{
    if (myTxtbx.Text == "Enter text here...") 
    {
     myTxtbx.Text = "";
    }
}

public void AddText(object sender, EventArgs e)
{
    if (string.IsNullOrWhiteSpace(myTxtbx.Text))
        myTxtbx.Text = "Enter text here...";
}

This code should provide the desired placeholder functionality, ensuring that the textbox displays the placeholder text when empty and allows user input when focused.

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