求1LINQ语句的写法

求一LINQ语句的写法。
是LINQ TO Object
有个集合persons，定义为List<PersonInfo>，有姓名，性别，部门等信息
现在要列出不同部门的人数
Sql语句很简单，表达方式是
Select Dept,Count(*) from persons Group by Dept

不知道LINQ语句如何写，还请指点（最好是vb.net格式)

[解决办法]
form p in persons 
group by p.Dept into g
select new
{
dept=g.dept,
g.count()

}
[解决办法]
http://www.cnblogs.com/thaught/articles/2083132.html
[解决办法]

VB.NET code

Dim query= Form p in list _Group p By p.Dept Into g = Group _Select New With{ .dept=g.Key, .Count=g.count()}
[解决办法]
 
VB.NET code
Dim query= From p in list _Group p By p.Dept Into g = Group _Select New With{ .dept=g.Key, .Count=g.count()}
[解决办法]
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 VB.NET code

Dim query= From p in list _
Group p By p.Dept Into g = Group _
Select New With{ .dept=g.Key, .Count=g.count()}