使用Linq to SQL删除表中的行

I have a sports database with a table groupmembers which have the fields ID, groupID and memberID. I get the memberID from a textbox called txtRemoveGroupMember and the groupID from a checkboxlist. Now i want to delete the rows wich has both the groupID and the memberID. I have tried this code:I have a sports database with a table groupmemb