Update Status on linkedin - asp.net

i want to update status on linkedin using linkedin user id, i am developing my final year degree project of social bookmaring site, i dont want to save username and password of the user, i am only saving userid of the user. plz help me.
when user login in to my site , only first time i want to authenticate user and next time in future i use Userid if linkedin to post his status.

Use ASP.NET Profiles.
http://msdn.microsoft.com/en-us/library/2y3fs9xs.aspx

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So, I wanna make a flutter app where there will be login for 10-15 people and these people will provide some sort of invitational code or token that other people need to put in textfield and then they can join the room of that person. I will do login for these 10-15 people with email authentication in firebase. So, please tell me how these people can generate invitational code or token for others to join them without any sort of id and pass.
try dynamic link with flutter and after link open then you can ask user to enter code and then if it is success then let the user in. enter link description here

How to get User data (name,image) in firebase authentication with facebook?

I create login page where user can login through facebook successfully but I only get user email and userid in firebase.
The thing I want is username, profile image, etc.
(Edited)
You can't get anyone's password through Firebase Authentication. That would be a huge security hole, wouldn't it? Profile image should be available, if the user provided one through Facebook.

Find User Id using the username of Linkedin developer API

If I have a friends Linkedin User Name, how can I get his UserId using the Linked-In Developer APIs ?
For instance if my friends linkedin public URL is https://www.linkedin.com/in/XXX-XXX-c802146 the username is XXX-XXX-c802146. So now I need to get the User Id of this user. How can I get this ?
If you have the user's actual profile URL, just go to the page source and do a text search for li:member: and you should spot references to the actual profile ID. This worked for my purposes.

Schedule and post comments to FaceBook wall using ASP.Net

i want to develop application like hootsuite . com
Schedule the FaceBook wall using ASP.Net
main question :
once user login in my system then he need to add his facebook user name and password once then how can i store that user's FB username and password because they need to Schedule and post comments to FaceBook wall so every time user will not login
can any once guide step by step ?
i hope you all help me
Thanks
once user login in my system then he need to add his facebook user name and password once then how can i store that user's FB username and password
This is completely the wrong approach – FB’s policies discourage users to share their login credentials with third-party services, and if your app will be caught asking for those, it will most likely be disabled quickly.
Get access tokens from the users, and use those to post.
https://developers.facebook.com/docs/authentication/, https://developers.facebook.com/roadmap/offline-access-removal/

Retrieve Email Id from FaceBook Login in vb.net application

I want to integrate Facebook with my .net application which is in vb.
I want to use facebook login as open id login to my application.
I reached to login with fb and get all basic information of my facebook profile.
But still I do not get facebook login id(means facebook login email id) in my user information detail retrieved from facebook.
Please help me out to solve this.
I get first name, last name and etc. but I want email id of facebook login or primary email address.
You'll have to prompt your users to grant the email permission. Then you'll be able to pull the email field in the same API call that you get their name and basic info.

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