u can call output parameters in ado.net through store 
procedure.

i have to write a one example 

sqlconnection con=new sqlconnection(" u can write 
Connection string here);
sqlcommand cmd=new sqlcommand();
cmd.ConnectionString=con;
cmd.CommandText="u can write stored procedure name here";
cmd.CommandType=CommandType.StoredProcedure;
SqlDataReader dr;
dr=cmd.ExecuteReader();//the stored procedure will be 
executed here.the out put parameters will be stored into 
datareader.
TextBox.Text1=dr.GetValue(0).ToString();//get the output 
values here.
TextBox.Text2=dr.GetValue(1).ToString();//get the output 
values here.