URL for HttpWebRequerst

Hi, I try to get a Power Bi Report List per c# code. My problem is to find the right URL for my workspace.

The error happens, when I try to get the report list from the xml string in line:

PBIReports PBIReports = JsonConvert.DeserializeObject<PBIReports>(json)

Can someone help please, I try:

var uri = String.Format("https://api.powerbi.com/v1.0/collections/{0}/workspaces/{1}/reports", workspaceName, workspaceId);

How I get workspaceName and the

workspaceId ?