今天来结贴，谢谢csdn的朋友，也带来一个问题 ：）

[feeling_vb]

private void method_1 ()
{
string aa = "";

string bb = "";

SqlConnection aa = new SqlConnection ( connstr );

aa.open();

SqlCommand cmd = new SqlCommand ( " select col_a from tab_a " ,aa );

SqlDataReader rec = cmd.ExecuteReader ( );

while ( rec.read() )
{

aa =rec[0].tostring();

bb = method_2 ( aa );

}

rec.close();
aa.close();

}



private string method_2 ( string TheCode )
{

string strName = "";

SqlConnection conb = new SqlConnection ( connstr );

conb.open();

SqlCommand cmd = new SqlCommand ( " select col_b from tab_b where code = '"+TheCode+"' " ,conb );

SqlDataReader rec = cmd.ExecuteReader ( );

if ( rec.read() )
{
strName = rec[0].tostring();
rec.close();
conb.close();
return strName;
}

rec.close();
conb.close();

return strName;

}


可是不让同时打开俩个记录集，这种情况怎么办？？？？

[declude]

可以使用dataset啊；

[zhangjunjie1]

用DataSet或DataVeiw

[remyxu]

method_2 开始先关了AA

[ddy2000]

DataReader一次只能用一个
用DataSet可以添加多张表的