fill the textbox with sapce in wpf

If you are restricting user with maximum number of lines then why you need to set Space in textbox?
what exactly you are trying to do ?

i dont want to enter space in textbox....i will only set the maximum of line and character of each lines.....
when we run the program then textbox automatically fill with space.....how?

Hi,
  you can fill textbox with spaces with text property & for setting up maximum line MaxLines property.
  here is the code how can you done this all :
  Xaml :
     
                  Text="    start with Spaces"
          Name="textbox1" TextAlignment="Center"
          TextWrapping="Wrap"
          MaxLength="500"
          MinLines="1"
          MaxLines="15" Margin="131,49,278,265" />
       
   

.cs code :
      private void btn_countChar_Click(object sender, RoutedEventArgs e)
        {
            int count=0;
            foreach (char c in textbox1.Text)
            {
                if (char.IsWhiteSpace(c))
                {
                    count++;
                }
            }
            MessageBox.Show("Spaces in TextBox: " + count.ToString());
        }