ASP.NET(C#)连接数据库和操作数据库

首先加入命名空间using System.Data.SqlClient;

1.查询

SqlConnection conn = new SqlConnection();

conn.ConnectionString = "Data Source=(local);Initial Catalog=数据库名;UserID=sa;Password=123456";

conn.Open();

string strsql=“select语句";

SqlCommand cmd = new SqlCommand(strsql, conn);

SqlDataReader sqlreader = cmd.ExecuteReader();

while (sqlreader.Read())

{

txtName.Text= sqlreader["列名"].ToString();

}

sqlreader.Close();

conn.Close();

2.插入、更新、删除

SqlConnection conn = new SqlConnection();

conn.ConnectionString = "Data Source=(local);Initial Catalog=数据库名;UserID=sa;Password=123456";

conn.Open();

strsql="update语句";// strsql="插入语句";//strsql="删除语句";

SqlCommand sqlcmd2 = new SqlCommand(strsql, conn);

int iResult = sqlcmd2.ExecuteNonQuery();

conn.Close();