How to get the list item using REST API in c#
<p>I want to retrieve all the list of SharePoint online using REST API in c#. 
For this, i am using below code</p>

<pre><code>HttpWebRequest endpointRequest = (HttpWebRequest)HttpWebRequest.Create("https://o365.sharepoint.com/sites/test-site/_api/web/lists");
endpointRequest.Method = "GET";
endpointRequest.Accept = "application/json;odata=verbose";
endpointRequest.ContentLength = 0;
</code></pre>

<p>But i am getting below error </p>

<p>403:Forbidden Access denied. Before opening files in this location. you must first browse to the web site and select the option to login automatically.</p>

<p>So i have searched on this and found that we have to pass AuthenticationToken, which is written in this link</p>

<p><a href="https://msdn.microsoft.com/en-us/library/jj164022.aspx" rel="nofollow">https://msdn.microsoft.com/en-us/library/jj164022.aspx</a></p>

<pre><code>endpointRequest.Headers.Add("Authorization", "Bearer " + accessToken);
</code></pre>

<p>But how do i get the accesstoken ?</p>