Hi Everyone, In Today's Post we are going to see Office 365 how to build and deploy a web part with sharepoint online. Prerequisites: 1. Visual Studio 2. SharePoint Site 3. Visual Studio 2010 Power Tools 4. Office 365 Site Note: Please install Visual Studio 2010 Power Tools before starting Please follow the below Procedure. Step 1 Run Visual Studio as an Administrator Step 2 Create a Project using "Empty SharePoint Project" Template Step 3 Specify the local Share Point site Url(Not o365) Step 4 Select "Deploy as Sandbox solution"option and click on Finish Step 5 Now Add Visual Web part(Sandbox) Template Step 6 Write your code as per the requirement Step 7 Build the Solution and Test the functionality in Local Site. Step 8 Package the solution by clicking on "Package" Option. Right click on solution ->Package Step 9 Now login into o365 Site as an Administrator Step 10 click on the solution Gallery Root site -> Site Actions -> Site Settings -> Galleries -> Solutions Step 11 Click on Solutions Step 12 Click on "Upload Solution" and browse the .wsp file that you have created in Visual Studio take wsp from bin's Debug/Release Folder of Solution. Step 13 Click on "Activate" button Step 14 Create Page and add the web part. Thats it.