ExtStreetviewControl
The ExtStreetviewControl is part of the GMaps Utility Library.
It's the best way to show the Streetview to your users.
Code.aspx
<cc1:GMap ID="GMap1" runat="server" />
Code.aspx.cs
GMap1.setCenter(new GLatLng(35.014975, 135.782479), 17);
ExtStreetViewControl extStreetViewControl = new ExtStreetViewControl();
//extStreetViewControl.controlStatus = ExtStreetViewControl.ControlStatusEnum.MINI;
//extStreetViewControl.hidden = true;
//extStreetViewControl.latlng = new GLatLng(35, 135.7);
extStreetViewControl.mainContent = ExtStreetViewControl.MainContentEnum.STREETVIEW;
//extStreetViewControl.pov = new GPov(1, 1, 1);
extStreetViewControl.size = new GSize(200,150);
GMarker marker = new GMarker(new GLatLng(35.014975, 135.782479));
extStreetViewControl.marker = marker;
GMap1.addControl(new GControl(extStreetViewControl));