double mysql select query from multiple tables

i would like to perform a double select query from a single table and create a stored procedure with it to fill a dataset like ds.Table[0].rows for first select query and ds.Table[1].rows for second select query in a foreach loop. below is select query i tried which gives me error saying:

"Operand should contain 1 column(s)"

SELECT DISTINCT a.profileID, b.feat_name  
FROM t_perm a, t_features b  
WHERE a.featureID = b.featureID AND a.profileID = 1
    IN
(SELECT DISTINCT a.ActionID, b.Act_name  
 FROM t_perm a, t_actions b 
 WHERE a.ActionID = b.ActionID)

c# code for dataset and foreach loop

                    cmd.Parameters.AddWithValue("@pprofileID", Convert.ToInt64(profileID));


                    MySqlDataAdapter mySqlDataAdapter = new MySqlDataAdapter(cmd);
                    DataSet dk = new DataSet();
                    mySqlDataAdapter.Fill(dk);
                    cmd.ExecuteNonQuery();
//                     kryptonDataGridViewFeature.DataSource = dk.Tables[0];

                       int iRow = 0;
                    //first select query
                    foreach (DataRow row in dk.Tables[0].Rows)
                    {
                        string strFeatureName;

                        strFeatureName = row["feat_name"].ToString();
                        if (strFeatureName == "client registration")
                        {
                            clientToolStripMenuItem.Enabled = true;
                        }

                    }
             //second select query
                    foreach (DataRow row in dk.Tables[1].Rows)
                    {


                    }

                    iRow = iRow + 1;


                }

                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message);
                }