This is the list of changelogs of Spire.PDFViewer New release and hotfix. You can get the detail information of each version's new features and bug solutions.

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Hot Fix Version: 7.12.0

Category ID Description
Bug SPIREPDFVIEWER-575 Fixed the issue that the application threw a "System.ArgumentNullException" exception when loading a PDF file.
Bug SPIREPDFVIEWER -576 Fixed the issue that the application threw a "System.OutOfMemoryException" exception when loading a PDF file.

Hot Fix Version: 7.11.0

Category ID Description
Bug SPIREPDFVIEWER-561 Fixes the issue that the document content did not load smoothly when scrolling pages.
Bug SPIREPDFVIEWER-564 Fixes the issue that the document content displayed incompletely.

Hot Fix Version: 7.7.1

Category ID Description
Bug SPIREPDFVIEWER-492 Optimizes document loading time.
Bug SPIREPDFVIEWER-542 Fixes the issue that the document became blank when viewing.
Bug SPIREPDFVIEWER-547 Fixes the issue that the application threw "value can not be null" when rotating PDF.
Bug SPIREPDFVIEWER-551 Fixes the issue that the stamp was lost when viewing.

Hot Fix Version: 7.1

Category ID Description
New feature SPIREPDFVIEWER-526 Supports rotating page when viewing PDF by PdfViewer.
Bug SPIREPDFVIEWER-205
SPIREPDFVIEWER-206
SPIREPDFVIEWER-532
Fixes the issue that the PDF content displayed was incorrect.
Bug SPIREPDFVIEWER-219
SPIREPDFVIEWER-524
SPIREPDFVIEWER-528
Fixes the issue that the PDF content displayed was blank.
Bug SPIREPDFVIEWER-378 Fixes the issue that the PDF text content displayed was garbled.
Bug SPIREPDFVIEWER-469 Fixes the issue that the scroll bars still existed after setting "fitpage" for the zoom mode.
Bug SPIREPDFVIEWER-518 Fixes the issue that the application threw "ArgumentOutOfRangeException" after changing the zoom mode.
Bug SPIREPDFVIEWER-519
SPIREPDFVIEWER-536
Fixes the issue that the PDF content displayed was incorrect when using in WPF project. 
Bug SPIREPDFVIEWER-520 Fixes the issue that the PDF image was covered.
Bug SPIREPDFVIEWER-543 Fixes the issue that some PDF content can not be displayed. 

Hot Fix Version: 6.8.6

Category ID Description
New feature SPIREPDFVIEWER-514 The ASP.NET control supports rotating pages.
input type=button id=PdfDocumentViewer1_btnRotate onfocus=this.blur() onclick=pdfdocumentviewer1.Rotate(pdfdocumentviewer1.RotateAngle + 270); value=rotate_270 
New feature SPIREPDFVIEWER-515 The ASP.NET control supports finding and highlighting text.
input type=text id=PdfDocumentViewer1_txtFindText onkeydown=if(event.keyCode==13){pdfdocumentviewer1.SearchText(this.value,true);return false;} value= 

 protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                this.PdfDocumentViewer1.FindTextHighLightColor =     System.Drawing.Color.FromArgb(125, 255, 0, 0);
                this.PdfDocumentViewer1.LoadFromFile(input.pdf);
            }
        }
Bug SPIREPDFVIEWER-369
SPIREPDFVIEWER-433
SPIREPDFVIEWER-508
Fixes the issue that the display content of the PDF was incorrect.
Bug SPIREPDFVIEWER-491 Fixes the issue that Chinese characters in PDF file were displayed incorrectly.
Bug SPIREPDFVIEWER-504 Fixes the issue that the ASP.NET control poped up an error message when no PDF file was loaded.
Bug SPIREPDFVIEWER-506 Fixes the issue that the image covered the text content.
Bug SPIREPDFVIEWER-513 Fixes the issue that the display content of the PDF was blurred.

Hot Fix Version: 6.6

Category ID Description
Bug SPIREPDFVIEWER-139 Fixes the issue that there were garbled characters after opening PDF files.
Bug SPIREPDFVIEWER-230
SPIREPDFVIEWER-440
Fixes the issue that the content was incorrect after opening PDF files.
Bug SPIREPDFVIEWER-476 Fixes the issue that the content was not displayed when zooming in to view the PDF.
Bug SPIREPDFVIEWER-440 Fixes the issue that it displayed a blank page after opening the PDF file.

Hot Fix Version: 6.3.2

Category ID Description
New Feature SPIREPDFVIEWER-482 Supports setting page label color of the thumbnail.
this.pdfDocumentThumbnail1.PageLabelColor = Color.Green;
this.pdfDocumentThumbnail1.PageLabelSelectedColor = Color.Yellow;
Bug SPIREPDFVIEWER-234 Fixes the issue that it did not take effect after setting the rotation.
Bug SPIREPDFVIEWER-238 SPIREPDFVIEWER-241 Fixes the issue that the display content of the PDF was incorrect.
Bug SPIREPDFVIEWER-254 SPIREPDFVIEWER-269 Fixes the issue that the highlight position was incorrect.
Bug SPIREPDFVIEWER-281 Fixes the issue that the WPF-PdfViewer control icon was displayed incorrectly.
Bug SPIREPDFVIEWER-483 Fixes the issue that the application threw the error “InvalidArgument“when loading the PDF file.

Hot Fix Version: 6.1

Category ID Description
New Feature SPIREPDFVIEWER-464 Supports the function of displaying page labels
Bug SPIREPDFVIEWER-448 Fixes the issue that the white color of the picture was displayed as black.
Bug SPIREPDFVIEWER-462 Fixes the issue that Chinese characters were displayed in garbled characters.
Bug SPIREPDFVIEWER-466 Fixes the issue that the page rotating failed.
Bug SPIREPDFVIEWER-467 Fixes the issue that the background color of form fields was displayed incorrectly.

Hot Fix Version: 5.11.2

Category ID Description
Bug SPIREPDFVIEWER-459 Fixes the issue that the font weight is not consistent with the source PDF when viewing in PDFViewer.
Bug SPIREPDFVIEWER-460 Fixes the issue that the application threw the "StackOverflowException" when setting the Dock of PDFViewer as Fill and minimizing the Form.

Hot Fix Version: 5.7.2

Category ID Description
Bug SPIREPDFVIEWER-431
SPIREPDFVIEWER-447
Fixes the issue that the content was not displayed correctly when viewing the PDF document.
Bug SPIREPDFVIEWER-449 Fixes the issue that the content of the exported image was incorrect.