4 KB articles

knowledge-base/radpdfprocessing-draw-pdf-page-background.md

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+---
+title: Draw a PDF Page Background Using RadPdfProcessing
+description: Learn how to draw a PDF page background by adding a colored rectangle behind the page content using RadPdfProcessing.
+type: how-to
+page_title: Draw PDF Page Background
+slug: radpdfprocessing-draw-pdf-page-background
+tags: pdf, processing, background, page, content, rectangle, color, fixed, document, draw
+res_type: kb
+---
+
+## Environment
+
+| Version | Product | Author |
+| ---- | ---- | ---- |
+| 2025.4.1104 | RadPdfProcessing | [Yoan Karamanov](https://www.telerik.com/blogs/author/yoan-karamanov) |
+
+## Description
+
+To draw a page background, you can create a colored [rectangle]({%slug radpdfprocessing-concepts-geometry%}#rectanglegeometry) and insert it at the beginning of the page's content collection so that it renders behind the rest of the content.
+
+## Solution
+
+The approach is to import the PDF, create a rectangle path sized to the page, and insert it into the page content at index `0` (first position).
+
+### Key Points
+* PDF pages don't have a built-in background property. Draw a rectangle to create a background.
+* Backgrounds are typically the first element in the page content, subsequent elements render above earlier ones.
+* Insert at index `0` to draw a background behind all content.
+* Size the rectangle to match `firstPage.Size` for full-page coverage.
+
+```csharp
+RadFixedDocument inputDocument;
+PdfFormatProvider pdfFormatProvider = new PdfFormatProvider();
+
+using (System.IO.Stream input = System.IO.File.OpenRead("input.pdf"))
+{
+    inputDocument = pdfFormatProvider.Import(input);
+}
+
+RadFixedPage firstPage = inputDocument.Pages.First();
+
+// Create the background
+RectangleGeometry rectangleGeometry = new RectangleGeometry();
+rectangleGeometry.Rect = new Rect(1, 1, firstPage.Size.Width, firstPage.Size.Height);
+
+Telerik.Windows.Documents.Fixed.Model.Graphics.Path path = new Telerik.Windows.Documents.Fixed.Model.Graphics.Path();
+path.Geometry = rectangleGeometry;
+
+path.IsFilled = true;
+path.Fill = new RgbColor(100, 150, 0, 0);
+
+// Insert the background (at position 1) into the first page
+firstPage.Content.Insert(0, path); // Use index '1' if the document already has a set background
+
+string pdfOutputPath = "output.pdf";
+
+System.IO.File.Delete(pdfOutputPath);
+using (System.IO.Stream output = System.IO.File.OpenWrite(pdfOutputPath))
+{
+    pdfFormatProvider.Export(inputDocument, output, TimeSpan.FromSeconds(10));
+}
+```
+## See Also
+* [RadPdfProcessing Overview]({%slug radpdfprocessing-overview%})
+

knowledge-base/radspreadprocessing-protect-specific-worksheet-cells.md

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+---
+title: Protect Specific Worksheet Cells Using RadSpreadProcessing
+description: Learn how to lock only specific worksheet cells while keeping the rest editable using RadSpreadProcessing.
+type: how-to
+page_title: Protect Specific Cells in RadSpreadProcessing
+slug: radspreadprocessing-protect-specific-worksheet-cells
+tags: spread, processing, worksheet, protection, lock, cells, used, range, performance, document
+res_type: kb
+---
+
+## Environment
+
+| Version | Product | Author |
+| ---- | ---- | ---- |
+| 2025.4.1104 | RadSpreadProcessing | [Yoan Karamanov](https://www.telerik.com/blogs/author/yoan-karamanov) |
+
+## Description
+
+This article shows how to protect only certain cells in a [Worksheet]({%slug radspreadprocessing-working-with-worksheets-what-is-worksheet%}) using [SpreadProcessing]({%slug radspreadprocessing-overview%}). The example demonstrates the most efficient way to keep all cells unlocked except the first row of a used range, which will remain locked and protected.
+
+## Solution
+
+In [SpreadProcessing]({%slug radspreadprocessing-overview%}), [Worksheet protection]({%slug radspreadprocessing-features-protection-worksheet%}) locks all cells by default. To protect only specific cells:
+
+1. Protect the worksheet.
+2. Unlock all columns (faster than iterating rows).
+3. Determine the used cell range.
+4. Lock only the first row cells within the used range.
+5. Export the result.
+
+Below is a complete example:
+
+```csharp
+Workbook workbook;
+IWorkbookFormatProvider xlsxFormatProvider = new XlsxFormatProvider();
+
+using (Stream input = new FileStream("input.xlsx", FileMode.Open))
+{
+    workbook = xlsxFormatProvider.Import(input, TimeSpan.FromSeconds(10));
+}
+
+Worksheet worksheet = workbook.ActiveWorksheet;
+
+// Protect the worksheet (default options)
+worksheet.Protect("telerik", WorksheetProtectionOptions.Default);
+
+// Unlock all columns in the worksheet (empty ones included)
+for (int columnIndex = 0; columnIndex <= SpreadsheetDefaultValues.ColumnCount - 1; columnIndex++)
+{
+    worksheet.Columns[columnIndex].SetIsLocked(false);
+}
+
+// Get the used cells range
+CellRange usedCellRange = worksheet.UsedCellRange;
+
+// Lock all first row cells of the used range
+for (int columnIndex = usedCellRange.FromIndex.ColumnIndex; columnIndex <= usedCellRange.ToIndex.ColumnIndex; columnIndex++)
+{
+    CellSelection cell = worksheet.Cells[0, columnIndex];
+    cell.SetIsLocked(true);
+}
+
+// Export to XLSX
+string xlsxOutputPath = "output.xlsx";
+using (Stream output = new FileStream(xlsxOutputPath, FileMode.Create))
+{
+    xlsxFormatProvider.Export(workbook, output, TimeSpan.FromSeconds(10));
+}
+```
+
+### Key Points
+* Protecting columns instead of rows is significantly faster because the maximum number of columns (16,384) is far smaller than the maximum number of rows (1,048,576).
+* By unlocking all columns first, you can selectively lock only the cells you need before applying protection.
+
+## See Also
+* [RadSpreadProcessing Overview]({%slug radspreadprocessing-overview%})
+* [Worksheet Protection]({%slug radspreadprocessing-features-protection-worksheet%})
+* [Iterating Used Cells]({%slug radspreadprocessing-working-with-cells-iterating-used-cells%})

knowledge-base/radwordsprocessing-change-bookmark-content-preserve-formatting.md

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+---
+title: Change Bookmark Content While Preserving Formatting using WordsProcessing
+description: Change the content of a bookmark while preserving its original formatting and properties using the WordsProcessing library.
+type: how-to 
+page_title: Change Bookmark Content While Preserving Formatting
+slug: radwordsprocessing-change-bookmark-content-preserve-formatting
+position: 0
+tags: bookmarks, formatting, words, processing, content, replace, change, flow, docx
+res_type: kb
+---
+
+|Product Version|Product|Author|
+|----|----|----|
+|2025.4.1104|RadWordsProcessing|[Yoan Karamanov](https://www.telerik.com/blogs/author/yoan-karamanov)|
+
+## Description
+
+This article shows how to change the content of an existing [Bookmark]({%slug radwordsprocessing-model-bookmark%}) in a DOCX document while preserving the original text formatting and character properties using the [WordsProcessing]({%slug radwordsprocessing-overview%}) library.
+
+## Solution
+
+* **Import DOCX**: Use [DocxFormatProvider]({%slug radwordsprocessing-formats-and-conversion-docx-docxformatprovider%}) to read the input DOCX and obtain a [RadFlowDocument]({%slug radwordsprocessing-model-radflowdocument%}).
+* **Initialize editor**: Create a [RadFlowDocumentEditor]({%slug radwordsprocessing-editing-radflowdocumenteditor%}) for cursor movement and editing.
+* **Find bookmark**: Enumerate [BookmarkRangeStart]({%slug radwordsprocessing-model-bookmark%}) elements and select the bookmark by **Name**.
+* **Capture formatting**: Get the first [Run]({%slug radwordsprocessing-model-run%}) within the bookmark and copy its **CharacterFormatting** properties.
+* **Delete original bookmark content**: Delete only the content between the start and end markers while keeping the bookmark structure intact.
+* **Position cursor**: Move the editor back to the start of the bookmark to insert new text in place.
+* **Copy formatting**: Apply the formatting of the original bookmark content to the editor properties.
+* **Insert text**: Add the replacement content.
+* **Export DOCX**: Write the updated document using [DocxFormatProvider]({%slug radwordsprocessing-formats-and-conversion-docx-docxformatprovider%}).
+
+#### [C#] Replace bookmark content but keep formatting
+
+```csharp
+RadFlowDocument document;
+DocxFormatProvider docxFormatProvider = new DocxFormatProvider();
+
+using (Stream input = File.OpenRead("input.docx"))
+{
+    document = docxFormatProvider.Import(input);
+    RadFlowDocumentEditor editor = new RadFlowDocumentEditor(document);
+
+    var documentBookmarks = document.EnumerateChildrenOfType<BookmarkRangeStart>().Select(b => b.Bookmark).ToList();
+
+    // Obtain bookmark by name
+    var specificBookmarkByName = documentBookmarks.FirstOrDefault(b => b.Name == "bookmark1");
+    // Obtain the first Run element inside the bookmark to copy its formatting
+    Run oldBookmarkText = (Run)specificBookmarkByName.BookmarkRangeStart.Paragraph.Inlines.FirstOrDefault(i => i is Run);
+
+    // Keep the bookmark and just change the content
+    editor.DeleteContent(specificBookmarkByName.BookmarkRangeStart, specificBookmarkByName.BookmarkRangeEnd, false);
+    editor.MoveToInlineEnd(specificBookmarkByName.BookmarkRangeStart);
+
+    // Apply the old formatting to the editor Method 1
+
+    editor.CharacterFormatting.CopyPropertiesFrom(oldBookmarkText.Properties);
+
+    // Apply the old formatting to the editor Method 2
+
+    editor.CharacterFormatting.FontSize.LocalValue = oldBookmarkText.FontSize;
+    editor.CharacterFormatting.FontFamily.LocalValue = oldBookmarkText.FontFamily;
+    editor.CharacterFormatting.FontStyle.LocalValue = oldBookmarkText.FontStyle;
+    editor.CharacterFormatting.FontWeight.LocalValue = oldBookmarkText.FontWeight;
+    editor.CharacterFormatting.Strikethrough.LocalValue = oldBookmarkText.Strikethrough;
+    editor.CharacterFormatting.FlowDirection.LocalValue = oldBookmarkText.FlowDirection;
+    editor.CharacterFormatting.BaselineAlignment.LocalValue = oldBookmarkText.BaselineAlignment;
+    editor.CharacterFormatting.ForegroundColor.LocalValue = oldBookmarkText.ForegroundColor;
+    editor.CharacterFormatting.HighlightColor.LocalValue = oldBookmarkText.HighlightColor;
+    editor.CharacterFormatting.UnderlineColor.LocalValue = oldBookmarkText.Underline.Color;
+    editor.CharacterFormatting.UnderlinePattern.LocalValue = oldBookmarkText.Underline.Pattern;
+
+    editor.InsertText("NEW CONTENT");
+
+    using (Stream output = File.OpenWrite("output.docx"))
+    {
+        docxFormatProvider.Export(document, output);
+    }
+}
+```
+![WordsProcessing Change Bookmark Content](images/words-processing-change-bookmark-content.png)
+
+## See Also
+* [Bookmark]({%slug radwordsprocessing-model-bookmark%})

knowledge-base/radwordsprocessing-modify-content-of-content-controls.md

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+---
+title: Modify the Content of Content Controls (SDTs) using WordsProcessing
+description: Learn how to change the content inside Structured Document Tags (Content Controls) by editing the document elements between their start and end markers.
+type: how-to
+page_title: How to Modify the Content of Structured Document Tags (Content Controls)
+slug: radwordsprocessing-modify-content-controls
+tags: content, controls, sdt, words, processing, structured, document, tags, flow, docx, fields
+res_type: kb
+---
+
+## Environment
+
+| Version | Product | Author |
+| --- | --- | ---- |
+| 2025.4.1104 | RadWordsProcessing | [Yoan Karamanov](https://www.telerik.com/blogs/author/yoan-karamanov) |
+
+## Description
+Structured Document Tags (SDTs), also known as [Content Controls]({%slug wordsprocessing-model-content-controls%}), are implemented in [WordsProcessing]({%slug radwordsprocessing-overview%}) using annotation markers. The markers are placed before and after the control’s content - **SdtRangeStart** at the beginning and **SdtRangeEnd** at the end. To modify the content of a content control, you must change the document elements between these two markers.
+
+## Solution
+
+The following example covers:
+
+* **Load and parse**: Imports an input DOCX using **DocxFormatProvider** and retrieves all SDTs via **EnumerateChildrenOfType<SdtRangeStart>()**.
+* **Classify by alias**: Iterates each SDT and uses **SdtProperties.Alias** to route updates for specific control types: "RichText", "ComboBox", "CheckBox", and "DatePicker".
+* **Preserve formatting**: For inline SDTs, collects all **Run** elements between **SdtRangeStart** and **SdtRangeEnd**, removes all but the first **Run**, and reuses that first **Run** to keep existing text formatting.
+* **Update values**:
+    * **RichText**: Sets the first run’s **Text** to the new string.
+    * **ComboBox**: Sets the first run’s **Text** to the selected item display text (e.g., "Item 3").
+    * **CheckBox**: Toggles **CheckBoxProperties.Checked** and updates the glyph in the first run using the appropriate **SdtCheckBoxState** (font + character code).
+    * **DatePicker**: Formats **DateTime.Now** using the SDT’s **DateProperties.DateFormat** and assigns the result to the first run’s **Text**.
+* **Save and open**: Exports the modified **RadFlowDocument** back to DOCX and opens the file to verify the changes.
+
+```csharp
+const string InputFile = "input.docx";
+const string OutputFile = "output.docx";
+
+static void Main(string[] args)
+{
+    var provider = new DocxFormatProvider();
+    var document = provider.Import(File.ReadAllBytes(InputFile), null);
+    var sdtRangeStarts = document.EnumerateChildrenOfType<SdtRangeStart>().ToList();
+
+    foreach (var sdtRangeStart in sdtRangeStarts)
+    {
+        if (sdtRangeStart.SdtProperties.Alias == "RichText")
+        {
+            ChangeRichTextValue(sdtRangeStart, "New RichText Value");
+        }
+        else if (sdtRangeStart.SdtProperties.Alias == "ComboBox")
+        {
+            ChangeComboBoxValue(sdtRangeStart, "Item 3");
+        }
+        else if (sdtRangeStart.SdtProperties.Alias == "CheckBox")
+        {
+            ChangeCheckBoxValue(sdtRangeStart);
+        }
+        else if (sdtRangeStart.SdtProperties.Alias == "DatePicker")
+        {
+            ChangeDatePickerValue(sdtRangeStart, DateTime.Now);
+        }
+    }
+
+    var bytes = provider.Export(document, null);
+    File.WriteAllBytes(OutputFile, bytes);
+    Process.Start(new ProcessStartInfo(OutputFile) { UseShellExecute = true });
+}
+
+private static void ChangeDatePickerValue(SdtRangeStart sdtRangeStart, DateTime now)
+{
+    var firstRun = ReturnFirstRunAndRemoveOthersFromSdt(sdtRangeStart);
+
+    var properties = (DateProperties)sdtRangeStart.SdtProperties;
+    firstRun.Text = now.ToString(properties.DateFormat);
+}
+
+private static void ChangeRichTextValue(SdtRangeStart sdtRangeStart, string value)
+{
+    var firstRun = ReturnFirstRunAndRemoveOthersFromSdt(sdtRangeStart);
+
+    firstRun.Text = value;
+}
+
+private static void ChangeComboBoxValue(SdtRangeStart sdtRangeStart, string value)
+{
+    var firstRun = ReturnFirstRunAndRemoveOthersFromSdt(sdtRangeStart);
+
+    firstRun.Text = value;
+}
+
+private static void ChangeCheckBoxValue(SdtRangeStart sdtRangeStart)
+{
+    var firstRun = ReturnFirstRunAndRemoveOthersFromSdt(sdtRangeStart);
+    CheckBoxProperties properties = (CheckBoxProperties)sdtRangeStart.SdtProperties;
+    if (properties.Checked.HasValue && properties.Checked.Value)
+    {
+        properties.Checked = false;
+
+        // If check box is currently checked, change it to unchecked
+        ApplyNewCheckBoxState(firstRun, properties.UncheckedState);
+    }
+    else
+    {
+        properties.Checked = true;
+
+        // If check box is currently unchecked, change it to checked
+        ApplyNewCheckBoxState(firstRun, properties.CheckedState);
+    }
+}
+
+private static void ApplyNewCheckBoxState(Run run, SdtCheckBoxState state)
+{
+    if (run != null)
+    {
+        run.Properties.FontFamily.LocalValue = new ThemableFontFamily(state.Font);
+        run.Text = ((char)state.CharacterCode).ToString();
+    }
+}
+
+private static Run ReturnFirstRunAndRemoveOthersFromSdt(SdtRangeStart sdtRangeStart)
+{
+    var runs = GetRunsInsideSdt(sdtRangeStart);
+
+    // Remove all but the first run inside the SdtRangeStart
+    // We want to keep the first run because it contains the formatting of the text
+    var paragraph = sdtRangeStart.Paragraph;
+    for (int i = 1; i < runs.Count; i++)
+    {
+        paragraph.Inlines.Remove(runs[i]);
+    }
+
+    return runs[0];
+}
+
+private static IList<Run> GetRunsInsideSdt(SdtRangeStart sdtRangeStart)
+{
+    List<Run> runs = new List<Run>();
+    var paragraph = sdtRangeStart.Paragraph;
+    var sdtStartIndex = paragraph.Inlines.IndexOf(sdtRangeStart);
+    for (int i = sdtStartIndex + 1; i < paragraph.Inlines.Count; i++)
+    {
+        if (paragraph.Inlines[i] is SdtRangeEnd sdtRangeEnd && sdtRangeEnd.Start == sdtRangeStart)
+        {
+            return runs;
+        }
+
+        if (paragraph.Inlines[i] is Run run)
+        {
+            runs.Add(run);
+        }
+    }
+
+    // It is possible that the SdtRangeEnd is inside another Paragraph
+    // For demo purposes we will handle only the case where the SdtRangeEnd is in the same Paragraph
+    return runs;
+}
+```
+![WordsProcessing Change SDT Content](images/words-processing-change-sdt-content.png)
+
+### Notes
+* Use [RadFlowDocumentEditor]({%slug radwordsprocessing-editing-radflowdocumenteditor%}) for higher-level operations like inserting SDTs via **InsertStructuredDocumentTag**.
+* The content control type (plain text, combo box, checkbox, etc.) is available through **SdtProperties.Type**. Adjust the replacement logic based on the control type when necessary.
+* Content controls can exist at different levels (block, inline, row, cell). Ensure you modify the correct collection (**Inlines**, **Blocks**, **Cells**, etc.) depending on where the SDT is placed. See [**Content Controls**]({%slug wordsprocessing-model-content-controls%}).
+
+## See Also
+* [Content Controls]({%slug wordsprocessing-model-content-controls%})