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TextBox.MaxLength Property

Gets or sets the maximum number of characters that can be manually entered into the text box.

Namespace:  System.Windows.Controls
Assembly:  PresentationFramework (in PresentationFramework.dll)
XMLNS for XAML: http://schemas.microsoft.com/winfx/2006/xaml/presentation, http://schemas.microsoft.com/netfx/2007/xaml/presentation

[LocalizabilityAttribute(LocalizationCategory.None, Modifiability = Modifiability.Unmodifiable)]
public int MaxLength { get; set; }
<object MaxLength="int" .../>

Property Value

Type: System.Int32
The maximum number of characters that can be manually entered into the text box. The default is 0, which indicates no limit.

Identifier field


Metadata properties set to true


You can use this property to restrict the length of text entered in the control for values such as postal codes and telephone numbers. You can also use this property to restrict the length of text entered when the data is to be stored in a database so that the text entered into the control does not exceed the maximum length of the corresponding field in the database.

This property does not affect characters that are added programmatically.

When this property is set to 0, the maximum length of the text that can be entered in the control is limited only by available memory.

The following example shows how to create a TextBox with a MaxLength of 500 characters.

<Page  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      Text="Initial text in TextBox" 
      MaxLines="5" />
StackPanel myStackPanel = new StackPanel();

//Create TextBox
TextBox myTextBox = new TextBox();
myTextBox.Width = 200;

// Put some initial text in the TextBox.
myTextBox.Text = "Initial text in TextBox";

// Set the maximum characters a user can manually type 
// into the TextBox.
myTextBox.MaxLength = 500;
myTextBox.MinLines = 1;

// Set the maximum number of lines the TextBox will expand to  
// accomidate text. Note: This does not constrain the amount of  
// text that can be typed. To do that, use the MaxLength property.
myTextBox.MaxLines = 5;

// The text typed into the box is aligned in the center.
myTextBox.TextAlignment = TextAlignment.Center;

// When the text reaches the edge of the box, go to the next line.
myTextBox.TextWrapping = TextWrapping.Wrap;

this.Content = myStackPanel;

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
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