Develop Reference

How to Add and update the comments for the PDF file using c#

Now I am working in the process of Insert and Update the comment for the pdf file using c# code. I want to Know the any possible way to insert a comment inside the pdf file. Anyone Know about this, Please reply and some reference for this process.

Microsoft does have very limited support for PDF in operating system APIs and it has come only recently in Windows 8 for modern applications (now called UWP) and that support doesn't go as far as updating comments.
So you need to use the 3rd party library. As far as I can tell SharpPDF is the only free library worth something, but I failed to open many PDFs in it so I can't recommend it. So I think you would need to search for some commercial library, I am aware of several of them that can do the job (e.g XfiniumPDF, iTextSharp etc) and you'll get the documentation when you license them.

Reading and Writing to Excel sheet in C# UWP Windows 10 App

I am working on a project for Windows 10 UWP App. I have below two problems
1. I have to upload excel sheet containing the data, and store that
data into Sq-lite Database.
2. Also I have to read data from database table, and write to excel sheet in
rows and column format.
I have searched a lot but could not find any library or helping blog. I would be thankful for any complete guide or sample code. Thanks!!

I would suggest you use Syncfusion Essential XlsIO. It does the work for your read/write of excel files (also works with Xamarin and ASP.Net). It has a 30-day free trial but you can get a free community license.

Just so you know, thx to .Net Standard 2.0 we are able to use the OpenXML SDK! This allows you to create and/or manipulate MS Office documents.
As an example I've blogged about creating Excel files on the fly in Xamarin Forms ( that also can generate an UWP app ) here http://depblog.weblogs.us/2017/10/13/net-standard-2-0-create-microsoft-office-documents-in-xamarin-forms/
The SDK itself is open source https://github.com/OfficeDev/Open-XML-SDK and there is a very large detailed documentation site available too https://msdn.microsoft.com/en-us/library/office/bb448854.aspx

Visualise map data in Excel

I have postcode level data in an Excel workbook and ideally I would like to have a map on another sheet of the area that I am interested in. The postcodes in my dataset should be highlighted within that map. I am using Excel 2010 and have no prior experience with GIS but plenty of experience with C#, Java. Any ideas of how I can achieve this? I looked for open source add-ins and didn't find an awful lot. Is there another way I can achieve what I want?

I use Topo.ly. You can just copy all your post codes from Excel and paste them in Topo.ly, and it will plot them on Google Maps. It also hosts your maps, so you can save it and come back to it later, or share it with others.

You can take a look to that solution for non-gis-users:
http://www.esri.com/software/esri-maps-for-office
It requires Office 2010 (that's no problem in your case) and it is based on a privative GIS software (no FLOSS). On the videos section there are some examples.

This can be a good starting point. You will need some knowledge of WPF
Bing Maps Windows Presentation Foundation (WPF) Control, Version 1.0
Then using VSTO you can integrate it into Excel
Using WPF Controls in Office Solutions
Sample WPF application is # Integrating Bing Maps With WPF
Edit :
Didnt find much on non WPF solution but you can give this a try
Integrating Virtual Earth Maps and Excel 2007 Using Visual Studio 2005 Tools for Office Second Edition
Download here http://archive.msdn.microsoft.com/VSTOVirtualEarthXL

For future reference or someone who has similar porblem, you can use an Excel add-in called Funfun to create data map in Excel 2016. I made two examples here.
As you could see, there is some code in the middle section of the screenshot. That is because Funfun allows you to write and run JavaScript code directly in Excel, also, the JavaScript code could use the data stored in the sheet. The capability of using JavaScript means that you could use 3rd party libraries like HighCharts.js or D3.js to plot charts like data map. In those two examples, I actually used highmaps which is part of the HighCharts.js library. The highmaps.js already has different templates from world map to specific map of different countries. I believe you could find the map you need.
Funfun also has an online editor in which you could test your JavaScript code with you data. You could check the detailed code of the examples above on the link below.
https://www.funfun.io/1/#/edit/5a5c9a50404f66229bda3ae0
https://www.funfun.io/1/#/edit/5925036104ce702ccfb22b0e
If you are satisfied with the result you achieved in the online editor, you could easily load the result into you Excel using the URL above. Of couse first you need to insert the Funfun add-in from Insert - My add-ins. Here are some screenshots showing how you could do this.
Disclosure: I'm a developer of Funfun

How to export Sql Server Data to Excel File in C#

How can one read sql server data and write it to excel file in C#?
Do I need to use an external .Net library, or is it just OK using Visual Studio itself?
Any example and link will be well appreciated..
Note: Please send examples for Winforms, not asp.net

I would use some kind of OR-Mapper to read data from SQL such as
NHibernate
Entity Framework
Linq 2 SQL
For writing data to Excel you could bind hardly to any Excel Version by referencing the Excel Assemblies. The cleaner and more beautiful way is to use Open XML SDK for Office http://www.microsoft.com/download/en/details.aspx?id=5124

Follow the below article, this even provide the facility to export the data into many formats.
Export data to Excel and other formats using C#

see:
http://www.c-sharpcorner.com/UploadFile/DipalChoksi/exportxl_asp2_dc11032006003657AM/exportxl_asp2_dc.aspx
http://geekswithblogs.net/VROD/archive/2008/04/20/121433.aspx

You could find helpful information how to achieve that goal in the following blog posts:
1. http://msmvps.com/blogs/deborahk/archive/2009/07/23/writing-data-from-a-datatable-to-excel.aspx
2. http://tim.mackey.ie/HowtoExportADatasetToExcelCAspnet.aspx

See : http://www.dotnetfunda.com/forums/thread548-export-data-to-excel-file-from-a-table-in-sql-server-using-csharp.aspx
It also has a nice example on the link inside the page.

Generating a Word Document with C#

Given a list of mailing addresses, I need to open an existing Word document, which is formatted for printing labels, and then insert each address into a different cell of the table. The current solution opens the Word application and moves the cursor to insert the text. However, after reading about the security issues and problems associated with opening the newer versions of Word from a web application, I have decided that I need to use another method.
I have looked into using Office Open XML, but I have not found any good resources that provide concrete information on exactly how to use it. Also, someone suggested that I use SQL reporting services, but searching for information on how to use them, lead me nowhere.
Which method do you think is the most appropriate for my problem?
Code samples and links to good tutorials would be extremely helpful.

Thanks for all the answers, but I really did not want to pay for a plugin and using Word automation was out of the question. So I kept searching and eventually, through some trial and error, found some answers.
After throughly searching through Microsoft's site, I found some newer articles on the Office Open XML SDK. I downloaded the new tools and just started going through each them.
I then found the Document Reflector, which creates a class to generate XML code based off an existing Word Document (.docx). Using my Label Template Document and the code this tool generated, I went through and added a loop that appends table cells for each address. It actually proved to be fairly simple and way faster than using Word automation.
So, if you're still using Word automation check out the Office Open XML tools. Their surprisingly extensive for a free download from Microsoft.
Office Open XML SDK 2.0 Download

I use the Words plugin from Aspose.com to do mail merges (programming guide).

You can take a look show 137 and 138 on dnrTV (www.dnrtv.com). In these video's Beth Massi shows how to do some editing and mail merging with OpenXML. She does this by using the Open XML SDK and xml literals in VB. It requires no third party components. Also it doesn't require MS Office to be installed on the machine.
This video inspired me as a C# developed (and no VB experience) to do some XML manipulation in a separate dll in VB. I call into this dll from my C# application.
It is worth a try.

We have the product Aspose that tvanfosson has mentioned. The edition that we purchased works with SQL Reporting Services so it can be used with the scheduler for creating output. It is really a great product and we used in a system that needed to support Korean characters in the final document. It works great and was under $1K with support. Not bad.
The advantage of using a product like this is that you can continue to manage your data and the skill set required to produce the documents is at a level where a variety of developers can support its use.

Vanstee,
If you really want to do this in code, check out this post I just found on Google
http://kellychronicles.spaces.live.com/blog/cns!A0D71E1614E8DBF8!1364.entry

If you are using reporting services cant you just move the information in the word doc into a database table and read it from there, taking word out of the equation?