How to Set Text Direction in Textbox in C#, VB.NET

using Spire.Doc;
using Spire.Doc.Documents;
using Spire.Doc.Fields;
using System;

namespace WordTextbox
{
    class Program
    {
        static void Main(string[] args)
        {
            // Instantiate document object
            Document document = new Document();

            //Add a section 
            Section section = document.AddSection();

            //Set the margin
            section.PageSetup.Margins.Left = 90;
            section.PageSetup.Margins.Right = 90;
            Paragraph paragraph = section.AddParagraph();

            //Add texbox 1
            TextBox textBox1 = paragraph.AppendTextBox(section.PageSetup.Margins.Left - 20, section.PageSetup.PageSize.Height + 20);
           
            //Fix the position of textbox 
            textBox1.Format.HorizontalOrigin = HorizontalOrigin.Page;
            textBox1.Format.HorizontalPosition = 0;
            textBox1.Format.VerticalPosition = -10f;
            textBox1.Format.VerticalOrigin = VerticalOrigin.Page;

            //Set the text vertically
            textBox1.Format.TextAnchor = ShapeVerticalAlignment.Center;
            textBox1.Format.LayoutFlowAlt = TextDirection.LeftToRight;

            //Add text and set the font
            Paragraph textboxPara1 = textBox1.Body.AddParagraph();
            TextRange txtrg = textboxPara1.AppendText("Name_______Number_________Class__________");
            txtrg.CharacterFormat.FontName = "Arial";
            txtrg.CharacterFormat.FontSize = 10;
            txtrg.CharacterFormat.TextColor = System.Drawing.Color.Black;
            textboxPara1.Format.HorizontalAlignment = HorizontalAlignment.Center;

            //Save the document
            document.SaveToFile("Result.docx");

        }
    }
}

Namespace WordTextbox
    
    Class Program
        
        Private Shared Sub Main(ByVal args() As String)
            Dim document As Document = New Document
            Dim section As Section = document.AddSection
            section.PageSetup.Margins.Left = 90
            section.PageSetup.Margins.Right = 90
            Dim paragraph As Paragraph = section.AddParagraph
            Dim textBox1 As TextBox = paragraph.AppendTextBox((section.PageSetup.Margins.Left - 20), (section.PageSetup.PageSize.Height + 20))
            textBox1.Format.HorizontalOrigin = HorizontalOrigin.Page
            textBox1.Format.HorizontalPosition = 0
            textBox1.Format.VerticalPosition = -10!
            textBox1.Format.VerticalOrigin = VerticalOrigin.Page
            textBox1.Format.TextAnchor = ShapeVerticalAlignment.Center
            textBox1.Format.LayoutFlowAlt = TextDirection.LeftToRight
            Dim textboxPara1 As Paragraph = textBox1.Body.AddParagraph
            Dim txtrg As TextRange = textboxPara1.AppendText("Name_______Number_________Class__________")
            txtrg.CharacterFormat.FontName= "Arial"
            txtrg.CharacterFormat.FontSize = 10
            txtrg.CharacterFormat.TextColor = System.Drawing.Color.Black
            textboxPara1.Format.HorizontalAlignment = HorizontalAlignment.Center
            document.SaveToFile("Result.docx")
        End Sub
    End Class
End Namespace