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一、Sql Server 在Visual Studio的連接有兩種方法：
（1）本地計(jì)算機(jī)連接;

復(fù)制代碼代碼如下:

string s = "Data Source=計(jì)算機(jī)名稱;initial Catalog=數(shù)據(jù)庫名稱;integrated Security=True";  

（2）windows身份驗(yàn)證方式連接;

復(fù)制代碼代碼如下:

string cc="Data Source = 計(jì)算機(jī)名稱; Initial Catalog = 數(shù)據(jù)庫名稱; User ID = sa; Password = 你的密碼";  

二、在Visual Studio中使用：
例1：查詢數(shù)據(jù)庫中的數(shù)據(jù)并且顯示出來

復(fù)制代碼代碼如下:

string s = "Data Source=計(jì)算機(jī)名稱;Initial Catalog=數(shù)據(jù)庫名稱;Integrated Security=True";  //此處使用本地計(jì)算機(jī)連接方式  
SqlConnection conn = new SqlConnection(s);   //創(chuàng)建連接  
conn.Open();    //打開連接  
SqlCommand cmd = conn.CreateCommand();  
cmd.CommandText = "select * from T_User";   //使用命令  
SqlDataAdapter adapter=new SqlDataAdapter(cmd);  
DataTable dt=new DataTable();  
adapter.Fill(dt);  
conn.Dispose();  //釋放所以資源  
cmd.Dispose();  
conn.Close();  //關(guān)閉連接  
string realname="";  
string username="";  
string mobile="";  
string address="";  
for (int i=0;idt.Rows.Count;i++)  
{  
    realname=dt.Rows[i][3].ToString();  
    username=dt.Rows[i][1].ToString();  
    mobile=dt.Rows[i][4].ToString();  
    address=dt.Rows[i][5].ToString();  
    Console.WriteLine("姓名為{0},用戶名為{1}，手機(jī)為{2},地址為{3}", realname, username, mobile, address);  
}  
Console.ReadKey();  

例2：刪除表中數(shù)據(jù)

復(fù)制代碼代碼如下:

string cc="Data Source = 計(jì)算機(jī)名稱; Initial Catalog = 數(shù)據(jù)庫名稱; User ID = sa; Password = 你的密碼";   //使用windows身份驗(yàn)證  
SqlConnection conn = new SqlConnection(s);  
conn.Open();  
SqlCommand cmd = conn.CreateCommand();  
cmd.CommandText = "delete from T_User where Id=5";  
cmd.ExecuteNonQuery();  
cmd.Dispose();  
conn.Close();  
Console.WriteLine("刪除成功");  
Console.ReadKey();  

例3：修改表中數(shù)據(jù)

復(fù)制代碼代碼如下:

string s = "Data Source=計(jì)算機(jī)名稱;initial Catalog=數(shù)據(jù)庫名稱;integrated Security=True";  
SqlConnection conn = new SqlConnection(s);  
conn.Open();  
SqlCommand cmd = conn.CreateCommand();  
cmd.CommandText = "update T_User set Card=@card where ID=3";  
cmd.Parameters.AddWithValue("@card", "13000000000000");  
cmd.ExecuteNonQuery();  
cmd.Dispose();  
conn.Close();  
conn.Dispose();  
Console.WriteLine("修改成功！");  
Console.ReadKey();  

例4：向表中插入數(shù)據(jù)

復(fù)制代碼代碼如下:

string s = "data source=計(jì)算機(jī)名稱;initial catalog=數(shù)據(jù)庫名稱;integrated security=true";  
SqlConnection conn = new SqlConnection(s);  
conn.Open();  
SqlCommand cmd = conn.CreateCommand();  
cmd.CommandText = "insert into T_User(UserName,Password,RealName,Mobile,Address) values(@username,@password,@realname,@mobile,@address)";  
cmd.Parameters.AddWithValue("@username", "xingxing");  
cmd.Parameters.AddWithValue("@password", "77777");  
cmd.Parameters.AddWithValue("@realname", "星星");  
cmd.Parameters.AddWithValue("@mobile", 1300000000);  
cmd.Parameters.AddWithValue("@address", "河北省北京市");  
cmd.ExecuteNonQuery();  
cmd.Dispose();  
conn.Close();  
conn.Dispose();  
Console.WriteLine("成功插入一行");  
Console.ReadKey(); 