“string”并不包含“conn”的定义
string strConnection = @"Data Source=.;Initial Catalog=new1;Integrated Security=True";
SqlConnection conn = new SqlConnection(strConnection);
conn.Open();
string strsql = "selcet * from [baoxiu] where [name]='session[userName]' and mon>='"+startime.Text+"' and mon<='"+overtime.Text+"'";
SqlDataAdapter cmd = new SqlDataAdapter(strsql.conn);
DataSet dataset =new DataSet();
cmd.Fill(dataset);
GridView2.DataSource = dataset;
GridView2.DataBind();
conn.Close();
应该没有问题吧？为什么会报错？

[解决办法]
SqlDataAdapter cmd = new SqlDataAdapter(strsql.conn); //这里不是.应该是下面的
SqlDataAdapter cmd = new SqlDataAdapter(strsql,conn);
[解决办法]
SqlDataAdapter cmd = new SqlDataAdapter(strsql.conn);

==>>

SqlDataAdapter cmd = new SqlDataAdapter(strsql, conn);
[解决办法]
看看介个呗
[解决办法]
我艹，你把逗号写成点号了！

太粗心了！
[解决办法]
SqlDataAdapter cmd = new SqlDataAdapter(strsql.conn);

语句和conn对象中间要用“，”隔开
我想你题目也写错了要写：
“strsql”并不包含“conn”的定义