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 = 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 = 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();