Open Alfresco dashboard from .net code

I am new to alfresco i require to by pass the alfresco login page when user clicks button from my website and pass that user login credentials. i tried below code after reading from alfresco forum but all time i am getting a parsing exception any one can help me with this.
I just need that when a user clicks on button on a new tab alfresco dashboard of that user gets open and login page is bypassed.

Dictionary parameters = new Dictionary();

// define binding type, in our example we are using ATOMPUB as stated above
parameters[DotCMIS.SessionParameter.BindingType] = BindingType.AtomPub;
// define CMIS available path which is already available under alfresco
parameters[DotCMIS.SessionParameter.AtomPubUrl] = "http://127.0.0.1:8080/share/";
//parameters[DotCMIS.SessionParameter.AtomPubUrl] = "https://localhost:8080/alfresco/service/cmis";
// alfresco portal admin user name
parameters[DotCMIS.SessionParameter.User] = "admin";
// alfresco portal admin password
parameters[DotCMIS.SessionParameter.Password] = "ayush@123";
string url = string.Format("http://127.0.0.1:8080/share/?User={0}&Password={1}", "admin", "ayush@123");

string s = "window.open('" + url + "', 'popup_window', 'width=300,height=100,left=100,top=100,resizable=yes');";
ClientScript.RegisterStartupScript(this.GetType(), "script", s, true);