How Can I Return A String Value

public string ExecuteScalar(String storedprocedure, params SqlParameter[] arrParam)
         {
string _result = "failure";
            SqlConnection cn = new SqlConnection(connection());
            try
            {
                //initialisation of datatable, Sql connection and sql command
                DataSet dt = new DataSet();
 
                SqlCommand cmd = new SqlCommand(storedprocedure, cn);
                cmd.CommandType = CommandType.StoredProcedure;
 
                //opens the db connection
                if (cn.State == ConnectionState.Closed || cn.State == ConnectionState.Broken)
                    cn.Open();
 
                //if sql param is not null then gets the parameters from that
                if (arrParam != null)
                {
                    foreach (SqlParameter param in arrParam)
                        cmd.Parameters.Add(param);
                }
                cmd.CommandTimeout = 5000;
                //executes the command and fills it into the datatable
              
               _result = "success";
            } 
            catch (Exception e)
            {                
               _result = "exception";
            }
            finally
            {
                cn.Close();
            }
return _result;
        }

public string ExecuteScalar(String storedprocedure, params SqlParameter[] arrParam)
         {
            SqlConnection cn = new SqlConnection(connection());
            try
            {
                //initialisation of datatable, Sql connection and sql command
                DataSet dt = new DataSet();
 
                SqlCommand cmd = new SqlCommand(storedprocedure, cn);
                cmd.CommandType = CommandType.StoredProcedure;
 
                //opens the db connection
                if (cn.State == ConnectionState.Closed || cn.State == ConnectionState.Broken)
                    cn.Open();
 
                //if sql param is not null then gets the parameters from that
                if (arrParam != null)
                {
                    foreach (SqlParameter param in arrParam)
                        cmd.Parameters.Add(param);
                }
                cmd.CommandTimeout = 5000;
                //executes the command and fills it into the datatable
              
                return "success";
            }
 
            catch (Exception ee)
            {
                
                return "failer";
            }
            finally
            {
                cn.Close();
            }
        }