How to create App for SharePoint

This article shows you how to create App for SharePoint.

This article expect you to know ASP.NET Web Forms Application.

I am using Visual Studio 2013 for this article.

1.      Start Visual Studio. Select FILE -> New -> Project…

2.      Select App for SharePoint template. Click OK.


3.      Type in the Office 365 SharePoint URL. Choose Provider-Host. Click Next.


4.      I choose ASP.NET Web Forms Application. Click Next.


5.      Choose Use a certificate (for SharePoint on-premises apps using high-trust). Type in password then click Finish.

I describe how I obtained the cer file here


6.      Office 365 will prompt you for Authentication. Type your authentication then click Sign In.


Now the Deafult.aspx page display for you.

7.      Drag a Label, Textbox, and Button Web Control into the aspx page.


8.      Add the code into the Button click Event.  

protected void Button1_Click(object sender, EventArgs e)


    string siteUrl =”;


    ClientContext clientContext = new ClientContext(siteUrl);

    SecureString securePassword = LoginO365.GetPassword();


    clientContext.Credentials = new SharePointOnlineCredentials(“”, securePassword);


    SP.List oList = clientContext.Web.Lists.GetByTitle(“Approval List”);

    ListItemCreationInformation itemCreateInfo = new ListItemCreationInformation();

    SP.ListItem oListItem = oList.AddItem(itemCreateInfo);

    oListItem[“Title”] = TextBox1.Text;

    //oListItem[“MyDescription”] = “Hello World!”;






Now you can run the application. Click Trust it if your Office 365 SharePoint prompt you this button.

About chanmingman

Since March 2011 Microsoft Live Spaces migrated to Wordpress ( till now, I have is over 1 million viewers. This blog is about more than 50% telling you how to resolve error messages, especial for Microsoft products. The blog also has a lot of guidance teaching you how to get stated certain Microsoft technologies. The blog also uses as a help to keep my memory. The blog is never meant to give people consulting services or silver bullet solutions. It is a contribution to the community. Thanks for your support over the years. Ming Man is Microsoft MVP since year 2006. He is a software development manager for a multinational company. With 25 years of experience in the IT field, he has developed system using Clipper, COBOL, VB5, VB6, VB.NET, Java and C #. He has been using Visual Studio (.NET) since the Beta back in year 2000. He and the team have developed many projects using .NET platform such as SCM, and HR based applications. He is familiar with the N-Tier design of business application and is also an expert with database experience in MS SQL, Oracle and AS 400.
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