https //api.powerbi.com/v1.0/myorg/datasets 403 forbidden

Can you provider detail about how to fix this issues.

I used below code to get access token and i got it successfully.

 protected void Page_Load(object sender, EventArgs e)
        {
            //Redirect uri must match the redirect_uri used when requesting Authorization code.
            string redirectUri = Properties.Settings.Default.RedirectUrl;
            string authorityUri = Properties.Settings.Default.AADAuthorityUri;
            string resourceUri = Properties.Settings.Default.PowerBiAPI;
            string clientId = Properties.Settings.Default.ClientID;
            string seceretId = Properties.Settings.Default.ClientSecretKey;
            // Get the auth code
            string code = Request.Params.GetValues(0)[0];
            TokenCache TC = new TokenCache();
            AuthenticationContext _authenticationContext = new AuthenticationContext(authorityUri, TC);
            ClientCredential cc = new ClientCredential(clientId, seceretId);
            AuthenticationResult AR = _authenticationContext.AcquireTokenAsync(resourceUri, cc).Result;
            Session["authResult"] = AR;
            //Redirect back to Default.aspx
            Response.Redirect("/Default.aspx");
        }

But when i try to get dataset with below code ,i am getting 403 forbidden error.

        protected void getDatasetsButton_Click(object sender, EventArgs e)
        {
            string responseContent = string.Empty;

            //The resource Uri to the Power BI REST API resource
            string datasetsUri = Properties.Settings.Default.PowerBiDataset;

            //Configure datasets request
            System.Net.WebRequest request = System.Net.WebRequest.Create(datasetsUri) as System.Net.HttpWebRequest;
            request.Method = "GET";
            request.ContentLength = 0;
            request.Headers.Add("Authorization", String.Format("Bearer {0}", authResult.AccessToken));

            //Get datasets response from request.GetResponse()
            using (var response = request.GetResponse() as System.Net.HttpWebResponse)
            {
                //Get reader from response stream
                using (var reader = new System.IO.StreamReader(response.GetResponseStream()))
                {
                    responseContent = reader.ReadToEnd();

                    //Deserialize JSON string
                    //JavaScriptSerializer class is in System.Web.Script.Serialization
                    JavaScriptSerializer json = new JavaScriptSerializer();
                    Datasets datasets = (Datasets)json.Deserialize(responseContent, typeof(Datasets));

                    resultsTextbox.Text = string.Empty;
                    //Get each Dataset from
                    foreach (dataset ds in datasets.value)
                    {
                        resultsTextbox.Text += String.Format("{0}\t{1}\n", ds.Id, ds.Name);
                    }
                }
            }
        }

Error Detail:'request.GetResponse()' threw an exception of type 'System.Net.WebException'
    Data: {System.Collections.ListDictionaryInternal}
    HResult: -2146233079
    HelpLink: null
    InnerException: null
    Message: "The remote server returned an error: (403) Forbidden."
    Response: {System.Net.HttpWebResponse}
    Source: "System"
    StackTrace: "   at System.Net.HttpWebRequest.GetResponse()"
    Status: ProtocolError
    TargetSite: {System.Net.WebResponse GetResponse()}

The Token which I got:

"Bearer eyJ0eXAiOiJKV1QiLCJhb.............TH4s-2866kDfaxnGhGU64g"