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TextBoxBase.AppendText Method

Appends text to the current text of a text box.

Namespace:  System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)
public void AppendText(
	string text
)

Parameters

text
Type: System.String

The text to append to the current contents of the text box.

You can use this method to add text to the existing text in the control instead of using the concatenation operator (+) to concatenate text to the Text property.

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);
}

.NET Framework

Supported in: 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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