C#连接SQLServer数据库完整步骤

求C#连接SQLServer数据库完整步骤，我刚刚入门，老师布置了作业，可是完全不懂啊

http://www.cnblogs.com/bluestorm/p/3368466.html

http://blog.csdn.net/kkkkkxiaofei/article/details/7904569

http://wenku.baidu.com/link?url=tZV7BPp8hqx-sjlYGuFJkJHUeD2Kn1TeL0w1kf5MoCpGHsUb-YEiNLQYaCCDxn1FBFHfYMSO3glmPI4xjxHpyE5aMuKALZ0lW8jqrhy2bqC