C# 找出集合中不同的数据

List

tablelist = new List();
bool isChongfu = false;
public void Save(Table table)
{

foreach (Table table1 in tablelist)
{
if (table.Uid.Equals(table1.Uid))
{
isChongfu = true;
}
}
if (isChongfu == false)
{
tablelist.Add(table);
}
else
{
MessageBox.Show("uid重复");
isChongfu = false;
}
}