string.Format("{0} Reviews", _store.Name);

"{0} Reviews"

string.Format(GetGlobalResourceObject("MyResources", "Label_Reviews").ToString(), _store.Name);

Label_Reviews --> "{0} Reviews"

<appSettings>
   <add key="1" value="TestString" />
</appSettings>

Name             | Value
-----------------+-------------------
reviews          | {0} Reviews

string.Format(Resource1.reviews, _store.Name);

public string reviews;

reviews = string.Format("{0} Reviews", _store.Name);

<%= reviews %>

public static Hashtable LabelResource = null;

Global.LabelResource["ReviewString1"].ToString()