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TextBoxBase.TextLength Property

Gets the length of text in the control.

Namespace: System.Windows.Forms
Assembly: System.Windows.Forms (in system.windows.forms.dll)

public virtual int TextLength { get; }
/** @property */
public int get_TextLength ()

public function get TextLength () : int

Not applicable.

Property Value

The number of characters contained in the text of the control.

You can use this property to determine the number of characters in a string for tasks such as searching for specific strings of text within the text of the control, where knowledge of the total number of characters is needed.

The following code example demonstrates how to use the AppendText method and the TextLength property to copy text from one TextBox to another. This example requires that two TextBox controls named, textBox1 and textBox2, have been added to a form and that textBox1 has text assigned to its Text property.

private void AppendTextBox1Text()
{
   // Determine if text is selected in textBox1.
   if(textBox1.SelectionLength == 0)
      // No selection made, return.
      return;
   
   // Determine if the text being appended to textBox2 exceeds the MaxLength property.
   if((textBox1.SelectedText.Length + textBox2.TextLength) > textBox2.MaxLength)
      MessageBox.Show("The text to paste in is larger than the maximum number of characters allowed");
   else
      // Append the text from textBox1 into textBox2.
      textBox2.AppendText(textBox1.SelectedText);
}

private void AppendTextBox1Text()
{
    // Determine if text is selected in textBox1.
    if (textBox1.get_SelectionLength() == 0) {
        // No selection made, return.
        return;
    }
    // Determine if the text being appended to textBox2 exceeds the MaxLength
    // property.
    if (textBox1.get_SelectedText().get_Length()
        + textBox2.get_TextLength() > textBox2.get_MaxLength()) {
        MessageBox.Show("The text to paste in is larger than the maximum"
            + " number of characters allowed");
    }        
    else {
        // Append the text from textBox1 into textBox2.
        textBox2.AppendText(textBox1.get_SelectedText());
    }        
} //AppendTextBox1Text

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

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