Public Shared Sub DocxChangeTextPropertiesExample()
    Dim templateFilename As String = "ChangeTextProperties_template.docx"
    Dim outFilename As String = "ChangeTextProperties.docx"
    Dim outPdfFilename As String = "ChangeTextProperties.pdf"

    ' create DocxDocumentEditor that allows to edit file "ChangeTextProperties_template.docx"
    Using editor As New Vintasoft.Imaging.Office.OpenXml.Editor.Docx.DocxDocumentEditor(templateFilename)
        ' get document body
        Dim documentBody As Vintasoft.Imaging.Office.OpenXml.Editor.OpenXmlDocumentElement = editor.Body

        ' set text color
        documentBody.FindText("COLOR").Substring(0, 2).SetTextProperties(CreateColorTextProperties(System.Drawing.Color.Red))
        documentBody.FindText("COLOR").Substring(2, 1).SetTextProperties(CreateColorTextProperties(System.Drawing.Color.Green))
        documentBody.FindText("COLOR").Substring(3, 2).SetTextProperties(CreateColorTextProperties(System.Drawing.Color.Blue))

        ' highlight text
        Dim highlightedTextProperties As New Vintasoft.Imaging.Office.OpenXml.Editor.OpenXmlTextProperties()
        highlightedTextProperties.Highlight = Vintasoft.Imaging.Office.OpenXml.Editor.OpenXmlTextHighlightType.Green
        documentBody.FindText("highlighted text").SetTextProperties(highlightedTextProperties)

        ' set text "bold text" as bold text
        documentBody.FindText("bold text").SetTextProperties(Vintasoft.Imaging.Office.OpenXml.Editor.OpenXmlTextProperties.BoldText)

        ' set text "italic text" as italic text
        documentBody.FindText("italic text").SetTextProperties(Vintasoft.Imaging.Office.OpenXml.Editor.OpenXmlTextProperties.ItalicText)

        ' set text "underline text" as underline text
        documentBody.FindText("underline text").SetTextProperties(Vintasoft.Imaging.Office.OpenXml.Editor.OpenXmlTextProperties.UnderlineText)

        ' set text "strike text" as striked out text
        documentBody.FindText("strike text").SetTextProperties(Vintasoft.Imaging.Office.OpenXml.Editor.OpenXmlTextProperties.StrikeText)

        ' change font size
        Dim setTextSize As New Vintasoft.Imaging.Office.OpenXml.Editor.OpenXmlTextProperties()
        setTextSize.FontSize = 16
        documentBody.FindText("text with size 16pt").Substring(0, 4).SetTextProperties(setTextSize)

        ' change text style
        Dim setTextStyle As New Vintasoft.Imaging.Office.OpenXml.Editor.OpenXmlTextProperties()
        setTextStyle.Style = editor.Styles.FindByName("RedStyle")
        documentBody.FindText("RedStyle").SetTextProperties(setTextStyle)

        ' save changed document to a DOCX file
        editor.Save(outFilename)

        ' export changed document to a PDF document
        editor.Export(outPdfFilename)
    End Using
End Sub

''' <summary>
''' Creates the color text properties.
''' </summary>
''' <param name="color">The color.</param>
Private Shared Function CreateColorTextProperties(color As System.Drawing.Color) As Vintasoft.Imaging.Office.OpenXml.Editor.OpenXmlTextProperties
    Dim result As New Vintasoft.Imaging.Office.OpenXml.Editor.OpenXmlTextProperties()
    result.Color = color
    Return result
End Function

public static void DocxChangeTextPropertiesExample()
{
    string templateFilename = "ChangeTextProperties_template.docx";
    string outFilename = "ChangeTextProperties.docx";
    string outPdfFilename = "ChangeTextProperties.pdf";

    // create DocxDocumentEditor that allows to edit file "ChangeTextProperties_template.docx"
    using (Vintasoft.Imaging.Office.OpenXml.Editor.Docx.DocxDocumentEditor editor =
        new Vintasoft.Imaging.Office.OpenXml.Editor.Docx.DocxDocumentEditor(templateFilename))
    {
        // get document body
        Vintasoft.Imaging.Office.OpenXml.Editor.OpenXmlDocumentElement documentBody = editor.Body;

        // set text color
        documentBody.FindText("COLOR").Substring(0, 2).SetTextProperties(CreateColorTextProperties(System.Drawing.Color.Red));
        documentBody.FindText("COLOR").Substring(2, 1).SetTextProperties(CreateColorTextProperties(System.Drawing.Color.Green));
        documentBody.FindText("COLOR").Substring(3, 2).SetTextProperties(CreateColorTextProperties(System.Drawing.Color.Blue));

        // highlight text
        Vintasoft.Imaging.Office.OpenXml.Editor.OpenXmlTextProperties highlightedTextProperties =
            new Vintasoft.Imaging.Office.OpenXml.Editor.OpenXmlTextProperties();
        highlightedTextProperties.Highlight = Vintasoft.Imaging.Office.OpenXml.Editor.OpenXmlTextHighlightType.Green;
        documentBody.FindText("highlighted text").SetTextProperties(highlightedTextProperties);

        // set text "bold text" as bold text
        documentBody.FindText("bold text").SetTextProperties(Vintasoft.Imaging.Office.OpenXml.Editor.OpenXmlTextProperties.BoldText);

        // set text "italic text" as italic text
        documentBody.FindText("italic text").SetTextProperties(Vintasoft.Imaging.Office.OpenXml.Editor.OpenXmlTextProperties.ItalicText);

        // set text "underline text" as underline text
        documentBody.FindText("underline text").SetTextProperties(Vintasoft.Imaging.Office.OpenXml.Editor.OpenXmlTextProperties.UnderlineText);

        // set text "strike text" as striked out text
        documentBody.FindText("strike text").SetTextProperties(Vintasoft.Imaging.Office.OpenXml.Editor.OpenXmlTextProperties.StrikeText);

        // change font size
        Vintasoft.Imaging.Office.OpenXml.Editor.OpenXmlTextProperties setTextSize =
            new Vintasoft.Imaging.Office.OpenXml.Editor.OpenXmlTextProperties();
        setTextSize.FontSize = 16;
        documentBody.FindText("text with size 16pt").Substring(0, 4).SetTextProperties(setTextSize);

        // change text style
        Vintasoft.Imaging.Office.OpenXml.Editor.OpenXmlTextProperties setTextStyle =
            new Vintasoft.Imaging.Office.OpenXml.Editor.OpenXmlTextProperties();
        setTextStyle.Style = editor.Styles.FindByName("RedStyle");
        documentBody.FindText("RedStyle").SetTextProperties(setTextStyle);

        // save changed document to a DOCX file
        editor.Save(outFilename);

        // export changed document to a PDF document
        editor.Export(outPdfFilename);
    }
}

/// <summary>
/// Creates the color text properties.
/// </summary>
/// <param name="color">The color.</param>
private static Vintasoft.Imaging.Office.OpenXml.Editor.OpenXmlTextProperties CreateColorTextProperties(System.Drawing.Color color)
{
    Vintasoft.Imaging.Office.OpenXml.Editor.OpenXmlTextProperties result =
        new Vintasoft.Imaging.Office.OpenXml.Editor.OpenXmlTextProperties();
    result.Color = color;
    return result;
}