public interface IGlobalVariable 

// get a global variable
IGlobalVariable gv = project.GlobalVariables["MyNamespace", "MyGlobalVariable"];
 
// get comment for current global variable
string comment = gv.Comment;
// if value is empty then set comment for global variable
if (String.IsNullOrWhiteSpace(comment)) gv.Comment = "Set the comment for this global variable";
 
// get name of global variable
string name = gv.Name;
// get namespace of global variable
string @namespace = gv.Namespace;
// get value of global variable
object value = gv.Value;
 
// show message about variable
System.Windows.Forms.MessageBox.Show(String.Format("Global variable value is {0}; comment {1}", value, comment), 
        String.Format("Information about variable {0} from namespace {1}", name, @namespace));

// get a global variable
$gv = $project->GlobalVariables->get_Item("MyNamespace", "MyGlobalVariable");
 
// get comment for current global variable
$comment = $gv->Comment;
// if value is empty then set comment for global variable
if (String::IsNullOrWhiteSpace($comment)) $gv->Comment = "Set the comment for this global variable";
 
// get name of global variable
$name = $gv->Name;
// get namespace of global variable
$namespace = $gv->Namespace;
// get value of global variable
$value = $gv->Value;
 
// show message about variable
System\Windows\Forms\MessageBox::Show(String::Format("Global variable: value is {0}; comment {1}", $value, $comment), 
        String::Format("Information about variable {0} from namespace {1}", $name, $namespace));