usingSystem;
usingSystem.Configuration;
usingSystem.Data.SqlClient;
usingSystem.Data;
usingSystem.Collections;
比如：
//打开数据库

转自：动态网制作指南www.knowsky.com
publicstaticSqlConnectionOpenConnection()
{
SqlConnectionmysqlConn=newSqlConnection(ConfigurationSettings.AppSettings["connstring"]);

try
{
mysqlConn.Open();
}
catch(Exceptione)
{
//rethrowthisexception
throwe;
}

returnmysqlConn;
}

//执行SQL返回DataSet
publicstaticDataSetGetDataSet(stringSQLQuery)
{
SqlConnectioncn=DBObject.OpenConnection();
SqlDataAdapterda=newSqlDataAdapter(SQLQuery,cn);
DataSetds=newDataSet();

da.Fill(ds);

//releaseresources
da.Dispose();
da=null;
cn.Close();
cn=null;

returnds;
}

//执行SQL语句
publicstaticvoidExecuteUpdateQuery(stringSQLQuery)
{
SqlConnectioncn=DBObject.OpenConnection();
SqlCommandcmd=newSqlCommand();

cmd.CommandText=SQLQuery;
cmd.CommandType=CommandType.Text;
cmd.Connection=cn;
cmd.ExecuteNonQuery();

cn.Close();
cn=null;
}

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