how to minimum text length in textbox in c#

how to minimum text length in textbox in c# -

private void TextBox_LostFocus(object sender, RoutedEventArgs e)
{
    if (((TextBox)sender).Text.Length &lt; 5)
    {
        MessageBox.Show("You need to write at least 5 characters");
    }
}

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how to minimum text length in textbox in c#

how to minimum text length in textbox in c# -

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