private static string CreateLayersString(IList<string> layers)
{
if (layers.Count == 0)//if no layers defined request all layers
return "";
var layerString = "&layers=all:";
for (var i = 0; i < layers.Count; i++)
{
layerString += layers[i];
if (i + 1 < layers.Count)
layerString += ",";
}
return layerString;
}