Validation of viewstate MAC failed.Application hosted by a Web Farm, ensure configuration

net 4.0 frame work, I had made many website in this frame work but never get such error "Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that <machineKey> configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster." I think so … Read more

create dynamic table in powerpoint using openXML with c# and ASP.net

I have used these links and got a working code where I can use a template report(containing placeolders) and generate new PPTX report with data I get from database. I have 4 more placeholders where I need to populate 4 different data tables. Currently I am using that template to create new slide and replacing placeholder for text but for tables I couldn’t figure out. I am able to generate the table using below code but not in placeholder’s location. Table always appear in center of screen.